Topic Index An educational, fair use website [close] accelerationa, angular‑velocityω, areaA, densityρ, dimensionD, electric‑currentI, electric‑fieldE, electric‑voltageV, electrical‑resistivityρ, energyE, forceF, frequencyf, frictionμ, lengthℓ, magnetic‑fieldB, massm, money$, number#, powerP, pressurep, refractionn, restitutioncor, temperatureT, timet, velocityv, volumeV * entries marked with an asterisk include editor's commentary Acceleration (Acceleration Due To Gravity) Acceleration perturbations of daily living More acceleration perturbations of daily living Acceleration of a car Acceleration of a dragster Acceleration of an elevator, cable Acceleration of an elevator, hydraulic Acceleration of a roller coaster Acceleration of a manned rocket* Acceleration of blackout in fighter pilots* Acceleration in a training centrifuge Acceleration of a medical centrifuge Acceleration that would deploy car airbags Acceleration that would break human bones Acceleration that would kill a human Acceleration of a cannonball Acceleration of a bullet Acceleration due to gravity at New York City Acceleration due to gravity at Quito, Ecuador Acceleration due to gravity on the moon Acceleration due to gravity on Mars Acceleration due to gravity: Super Mario Brothers Angular Velocity (Angular Speed)☝ Angular speed of the earth Angular speed of a phonograph record* Angular speed of a floppy disk Angular speed of a hard disk drive Angular speed of a CD Angular speed of a DVD Angular speed of a car engine Angular speed of a truck engine Angular speed of a jet turbine Angular speed of a training centrifuge Angular speed of a medical centrifuge Angular speed of a kitchen blender Area (Surface Area)☝ Area of a ping pong paddle Area of a badminton racket Area of a tennis racket Area of a ping pong table Area of a tennis court Area of a basketball court Area of a football field (soccer pitch) Area of a football field (American) Area of a football field (Canadian) Area of a baseball field Area of a newspaper Area of Manhattan Area of Brooklyn Area of New York City Area of New York State Area of the polar ice caps Area of earth's land surface Area of earth's oceans Surface area of human skin Density (Specific Gravity)☝ Density of the universe Density of outer space* Density of the solar wind Density of the best laboratory vacuum Density of air* Density of ice Density of water Density of steam Density of sea water Density of blood Density of milk Density of beer* Density of cooking oil Density of petroleum Density of soap Density of bone Density of wood Density of a Space Shuttle tile Density of concrete* Density of glass Density of steel Density of gold Density of platinum Density of plutonium* Density of uranium Density of osmium Density of the earth Density of Saturn Density of the sun Density of a white dwarf star Density of a neutron star Dimension (Fractal Dimension)☝ Fractal dimension of bread Fractal dimension of broccoli Fractal dimension of the coast of Maine Fractal dimension of leaves Fractal dimension of stock price changes Electric Current☝ Electric current from a 1.5 V battery Electric current from a car battery Electric current through a microwave oven Electric current through a refrigerator Electric current through an air conditioner Electric current through an electric stove Electric current through a home Electric current through an arc welder [not MIG or TIG] Electric current through a MIG welder Electric current through a TIG welder Electric current through an arc furnace Electric current from an electric eel Electric current of a stun gun Electric current used in electroshock therapy Electric current needed to kill a human Electric current through an electric chair* Electric current through a lightning bolt Electric current through the atmosphere Electric Field (Dielectric Strength)☝ Dielectric strength of air Dielectric strength of glass, crown Dielectric strength of glass, pyrex (borosilicate glass) Dielectric strength of mica Dielectric strength of silicone Dielectric strength of transformer oil Dielectric strength of paper Dielectric strength of polyethylene Dielectric strength of polypropylene Dielectric strength of fused quartz Dielectric strength of waxed paper Dielectric strength of air Electric field inside a typical US home Electric field near a cellular telephone Electric field on earth* Electric field on the sun Electric Potential (Electromotive Force, Potential Difference, Voltage)☝ Voltage of an alkaline battery Voltage of a nickel metal hydride battery Voltage of a nickel cadmium battery Voltage of a car battery Voltage of a truck battery Voltage of household electrical outlets Voltage of a fluorescent tube Voltage of a neon light Voltage of a mercury light Voltage of a sodium vapor light Voltage of a television picture tube Voltage of automobile spark plugs Voltage of an electric eel Voltage of an electric fence Voltage of an electron microscope Voltage of a nerve cell Voltage of a stun gun Voltage of electroshock therapy Voltage used to resuscitate a human heart Voltage of an electric chair* Voltage of power transmission lines Voltage of a lightning bolt Electrical Resistivity (Reciprocal of Electrical Conductivity)☝ Resistivity of aluminum Resistivity of aluminum oxide Resistivity of carbon, amorphous Resistivity of carbon, diamond Resistivity of carbon, graphite Resistivity of copper Resistivity of glass Resistivity of germanium Resistivity of gold Resistivity of iron Resistivity of mercury Resistivity of mica Resistivity of nichrome Resistivity of quartz Resistivity of silicon Resistivity of silver Resistivity of steel Resistivity of tungsten Resistivity of water, distilled Resistivity of water, seawater Resistance of a resistor: Blame the students or blame the resistors? Energy (Energy Density)☝ Energy in ATP Energy of the most extreme cosmic rays Energy of the most extreme gamma rays Energy consumption of a human Energy of a 1.5 V battery Energy of a car battery Energy of a truck battery Energy in a cubic meter of natural gas Energy in a barrel of petroleum Energy in a ton of coal Energy in a ton of TNT Energy of a nuclear explosion* Energy consumption of New York City Energy consumption of China Energy consumption of the United States Energy consumption of Africa Energy consumption of Asia Energy consumption of Australia Energy consumption of Europe Energy consumption of North America Energy consumption of South America Energy consumption of the earth Energy density of hydrogen Energy density of methane Energy density of propane Energy density of butane Energy density of gasoline Energy density of kerosene Energy density of aviation fuel Energy density of diesel fuel Energy density of heating oil Energy density of methanol (wood alcohol) Energy density of ethanol Energy density of petroleum Energy density of natural gas Energy density of wood Energy density of coal Energy density of carbohydrates Energy density of fats Energy density of protein Force (Tension, Thrust, Weight)☝ Force on a microelectromechanical system (MEMS) Force of a windmill slam dunk: Vince Carter Force of a windmill slam dunk: Dominique Wilkins Force on a runner's foot Force of a bat on a baseball Force of a tennis racket on a tennis ball Force of a golf club on a golf ball Force of a superhero: Superman Returns Tension of power transmission (high tension) lines Tension in Spider-Man's webs Things that weigh a newton Thrust of a jet engine Thrust of a space shuttle Weight of an apple Friction (Coefficient of Friction)☝ Coefficients of friction for aluminum Coefficients of friction for concrete Coefficients of friction for glass Coefficients of friction for graphite Coefficients of friction for granite Coefficients of friction for human joints Coefficients of friction for human skin Coefficient of friction for skin: The Incredible Hulk Coefficients of friction for ice Coefficients of friction for paper Coefficients of friction for rubber Coefficients of friction for snow Coefficients of friction for steel Coefficients of friction for teflon Coefficients of friction for wood Frequency☝ Frequency of middle C Frequency of a beating heart Frequency of brain waves Frequency of bee wings Frequency of fly wings Frequency of mosquito wings Frequency of hummingbird wings Frequency of a cat's purr Frequency of dolphin sonar Frequency of bat sonar Frequency range of human hearing Frequency range of dog hearing Frequency used in ultrasonic cleaning Frequency used in ultrasonic imaging* Frequency used in navigational sonar Frequency of ELF transmissions Frequency of cosmic microwave background Frequency of a microwave oven* Frequency of a police radar gun Frequency of the lowest electromagnetic waves Frequency of the highest electromagnetic waves Length (Altitude, Center of Mass, Depth, Diameter, Distance, Focal Length, Height, Range, Resolution, Size, Thickness, Wavelength)☝ Altitude of highest permanent human habitation Altitude of human survivability, maximum [vertical limit] Altitude of the lowest point on earth Altitude of the highest point on earth Altitude of the lowest point on Mars Altitude of the highest point on Mars Altitude of the lowest parachute jump Altitude of the highest parachute jump* Altitude of a commercial jet airplane Altitude of a spy plane Altitude of the highest airplane flight* Altitude of the highest toy balloon flight Altitude of the highest manned balloon flight* Altitude of the highest unmanned balloon flight Altitude of the ozone layer Altitude of the space shuttle Altitude of a geosynchronous or geostationary satellite Center of mass of a human Depth of the Grand Canyon Depth of Valles Marineris Depth of the deepest mine Depth of the deepest drilling Depth of the deepest dive without breathing apparatus Depth of the deepest dive with breathing apparatus Depth of the deepest dive in a submarine Depth of the deepest dive in a bathyscaphe Depth of the ocean Depth of the deepest point in the ocean Diameter of an electron Diameter of a proton Diameter of an atom Diameter of a virus* Diameter of a bacterium* Diameter of a yeast Diameter of a protozoan Diameter of an optical fiber Diameter of a human hair* Diameter of a human eye Diameter of a snowflake Diameter of a raindrop* Diameter of a hailstone Diameter of a speck of dust Diameter of a grain of sand Diameter of a golf ball Diameter of a tennis ball Diameter of a baseball Diameter of a softball Diameter of a bowling ball Diameter of a football (soccer ball) Diameter of a basketball Diameter of a cannonball Diameter of an igloo Diameter of Pluto Diameter of earth Diameter of the earth's orbit Diameter of the moon Diameter of the moon's orbit Diameter of the sun Diameter of the solar system Diameter of the Milky Way Diameter of the known universe* Distance between carbon atoms Distance of the longest putted golf ball Distance of the longest driven golf ball* Distance of the longest batted baseball Distance of the farthest animal migration Distance to the nearest star Distance to the nearest galaxy* Distance to the most distant observed object* Focal length of a human eye* Focal length of eyeglasses Focal length of a magnifying glass Focal length of a camera lens Focal length of binoculars Focal length of an astronomical telescope Height of a newborn baby Height of an adult human Height of the tallest tree Height of a pop fly Height of a domed stadium Height of the Great Pyramid Height of the tallest building* Height of the tallest mountain on earth* Height of the tallest mountain on Mars Length of a human DNA molecule* Length of a human esophagus Length of a human intestine Length of the human alimentary canal Length of a lacrosse stick Length of a baseball bat Length of a golf club Length of a hockey stick Length of a javelin Length of a fishing rod Length of a bowling alley Length of a football field (American) Length of a football field (Canadian) Length of a football field (soccer pitch) Length of high voltage electric power transmission lines Length of submarine telecommunications cables Range of a shotgun pellet Range of a handgun bullet* Range of a rifle bullet Range of an artillery shell Range of a Scud missile Range of a cruise missile Range of a ballistic missile Resolution of an electron microscope* Resolution of an optical microscope Resolution of a spy satellite Separation between tracks on a CD Separation between tracks on a DVD Size of a human: Body proportions Size of a shoe: More body proportions Thickness of a cell membrane Thickness of a cell wall Thickness of gold leaf Thickness of a piece of paper Thickness of a leaf Thickness of a dollar bill Thickness of Arctic ice Thickness of the Greenland ice cap Thickness of the Antarctic ice cap Thickness of the ozone layer Thickness of earth's atmosphere Thickness of Saturn's rings Wavelength of the shortest electromagnetic waves Wavelength of the longest electromagnetic waves Wavelength of the sun's peak radiation output Wavelength of maximum human visual sensitivity Wavelength range of visible light Magnetic Field (Magnetic Flux Density, Magnetic Induction)☝ Magnetic field on earth Magnetic field on Jupiter Magnetic field of the Milky Way Magnetic field inside a typical US home Magnetic field of a MetroCard Magnetic field near a cellular telephone Magnetic field of a soft iron magnet Magnetic field inside a TV picture tube Magnetic field of a lifting electromagnet Magnetic field inside an MRI* Magnetic field of the strongest magnet* Mass☝ Mass of the heaviest man-made element* Mass of a snowflake Mass of a raindrop Mass of a hailstone Mass of a golf ball Mass of a handball Mass of a tennis ball Mass of a billiard ball Mass of a baseball Mass of a softball Mass of a dodge ball Mass of a football (American) Mass of a football (soccer ball) Mass of a bowling ball Mass of a grain of sand Mass of a bullet Mass of a cannonball Mass of a chemical bomb Mass of a nuclear bomb or warhead Mass of a penny Mass of a physics textbook Mass of a car Mass of a train Mass of an airplane, general aviation Mass of an airplane, commercial aviation Mass of a space shuttle Mass of the World Trade Center Mass of a virus Mass of a bacterium Mass of a dog Mass of an elephant Mass of a whale Mass of a human head Mass of a human brain Mass of a human heart Mass of a human liver Mass of a newborn baby Mass of an adult Mass of all the people on earth Mass of US rice production Mass of US corn production Mass of US wheat production Mass of US potato production Mass of US heroin consumption Mass of US cocaine consumption Mass of US marijuana production Mass of US marijuana consumption Mass of US breakfast cereal consumption Mass of US salsa consumption Mass of US ketchup consumption Mass of US beef production Mass of US beef consumption Mass of trash produced by New York City Mass of the atmosphere Mass of the biosphere Mass of the oceans Mass of the earth Mass of the moon Mass of Jupiter Mass of Pluto Mass needed to create a star Mass of the sun Mass needed to create a neutron star* Mass needed to create a black hole Mass of the Milky Way Mass of the universe Money (Cost, Earnings, Income, Price, Salary, Worth)☝ Cost of living in New York City Cost of living in the US Cost of living for the average person on earth Income of the average New Yorker Income of the average American Income of the average person on earth Price of liquid helium Price of liquid nitrogen Price of water Price of petroleum (crude oil) Price of diesel fuel Price of gasoline Price of kerosene Price of propane Price of natural gas Price of coal Price of ethanol (grain alcohol) Price of electric energy Price of concrete Price of steel Price of diamond Price of copper Price of silver Price of gold Price of platinum Price of plutonium Price of uranium Price of a high school education Price of a college education Salary of a professor Salary of a teacher Salary of a doctor Salary of an engineer Salary of a biologist Salary of a chemist Salary of a geologist Salary of a meteorologist Salary of a physicist Salary of a baseball player Salary of a basketball player Salary of a football player (American) Salary of a football player (Canadian) Salary of a football player (soccer) Salary of a hockey player Worth of the average person in New York City Worth of the average person in the US Worth of the average person on earth Worth of the wealthiest person in New York City Worth of the wealthiest person in the US Worth of the wealthiest person on earth Number (Population)☝ Number of colors distinguishable by the human eye Number of frequencies distinguishable by the human ear Number of neurons in a human brain Number of hairs on a human head Number of transistors on an integrated circuit Number of pages in a science review book Number of pages in a physics textbook Number of books published Number of web pages Number of nuclear weapons capable nations Number of nuclear warheads* Number of artificial satellites Number of cars* Number of personal computers in the US Number of televisions in the US Number of telephones [US, other country or region, or world] Number of cellular phones in the US Number of crimes in New York City Number of crimes in New York State Number of crimes in the US Number of people in a family Number of billionaires Number of people living in poverty Number of people in New York City Number of people in the US Number of people on earth Number of births in New York City Number of births in the US Number of births on earth Number of deaths in New York City Number of deaths in the US Number of deaths on earth Number of obese people in the US Number of rats in New York City* Number of pigeons in New York City Number of ants in the world Number of cockroaches Number of beetles Number of orchids Number of species Number of planets Number of asteroids Number of comets Number of extrasolar planets Number of stars in the Milky Way Number of galaxies in the universe Number of words in the English language Number of languages on earth Power (Power Density)☝ Power of a human brain Power of a human heart Power of human lungs Power of a human Power of a mutant: Storm from X-Men Power of a horse [but, not just the definition of the unit horsepower] Power of a 1.5 V battery Power of a personal stereo Power of a car stereo Power of a home stereo Power of a toaster Power of a microwave oven Power of an electric oven Power of a refrigerator Power of an air conditioner Power of a car battery Power of a car Power of a truck Power of a train* Power of a cruise ship Power of an aircraft carrier Power of a fighter plane Power of a space shuttle Power of the first laser Power of a barcode reader laser Power of a laser pointer Power of the strongest laser* Power of car headlights Power of a streetlight Power of a searchlight Power of a lighthouse Power of a cell phone transmitter Power of a cell site transmitter Power of a radio/television broadcast transmitter Power of a commercial power plant Power of a nuclear reactor Power consumption of a home Power consumption of New York City Power consumption of New York State Power consumption of the United States Power consumption of China Power consumption of Africa Power consumption of Asia Power consumption of Australia Power consumption of Europe Power consumption of North America Power consumption of South America Power consumption of the earth Power of the sun* Power of a quasar Power density of solar radiation Pressure (Compression Strength)☝ Compression strength of bone and brick: Sin City Compression strength of bone Compression strength of brick Compression strength of concrete Compression strength of granite Compression strength of marble Compression strength of plaster (blue board, drywall, gypsum board, etc.) Compression strength of porcelain Compression strength of steel Compression strength of wood Pressure in outer space* Pressure of the best laboratory vacuum Pressure of the threshold of human hearing Pressure to rupture an eardrum Pressure in a human eye Pressure in the human circulatory system (blood pressure)* Pressure in the human circulatory system: Is gender a factor? Pressure in human lungs Pressure on earth, highest Pressure on earth, lowest Pressure on the surface of Venus Pressure on the surface of Mars Pressure on the surface of Titan Pressure in a basketball Pressure in a bicycle tire Pressure in a car tire Pressure in a truck tire Pressure in a tractor tire Pressure in a can of soda Pressure in a champagne bottle Pressure in a pressure cooker Pressure in an espresso machine Pressure used to manufacture puffed cereal Pressure in a fire extinguisher Pressure under high heels Pressure at the deepest point in the Great Lakes Pressure at the deepest point in the oceans Pressure under the Antarctic ice cap Pressure used to create artificial diamonds Pressure of the most extreme laboratory experiment Pressure at the center of the earth* Pressure at the center of Jupiter Pressure at the center of the sun Refraction (Index of Refraction, Refractive Index)☝ Index of refraction of air Index of refraction of diamond Index of refraction of ethanol [ethyl alcohol] Index of refraction of glass, crown Index of refraction of glass, flint Index of refraction of glycerol Index of refraction of Lucite Index of refraction of quartz Index of refraction of ruby and sapphire Index of refraction of sodium chloride (table salt) Index of refraction of vegetable oil Index of refraction of water Index of refraction of ice Index of refraction of cubic zirconia Index of refraction of various household liquids: glycerin, floor cleaner, degreaser, shower gel, baby wash Index of refraction of various household liquids: vinegar, honey, floor cleaner, throat medicine, foot wash Restitution (Coefficient of Restitution)☝ Coefficients of restitution Temperature☝ Temperature of the coldest laboratory experiment Temperature of the hottest laboratory experiment* Temperature on earth Temperature on earth, coldest* Temperature on earth, hottest* Temperature of the ocean Temperature of a healthy human (body temperature)* Temperature of a healthy human (skin temperature) Temperature of a healthy cow Temperature of a healthy dog Temperature of an American bath Temperature of a Japanese bath (お風呂) Temperature of a sauna Temperature at which coffee is brewed Temperature at which tea is brewed, 茶酿造的温度 Temperature at which beer is brewed Temperature at which beer is fermented Temperature of steam in an espresso machine Temperature at which beef is cooked Temperature at which chicken is cooked Temperature at which fish is cooked Temperature at which lamb is cooked Temperature at which pork is cooked Temperature of steam used for heating Temperature of steam in a turbine Temperature of a home oven Temperature of a pizza oven* Temperature of a soldering iron* Temperature of an arc welder [not a MIG or TIG] Temperature of a MIG welder Temperature of a TIG welder Temperature of an oxyacetylene torch Temperature of a blast furnace Temperature of an arc furnace Temperature of a "red hot" object Temperature of a "white hot" object Temperature at the center of the earth Temperature of a candle flame Temperature of a blue flame* Temperature of an incandescent light bulb* Temperature of a halogen light bulb Temperature of a lightning bolt* Temperature of a nuclear explosion* Temperature of the cosmic microwave background radiation* Temperature on the surface of Mercury* Temperature on the surface of Venus* Temperature on the surface of Mars* Temperature on the surface of Pluto Temperature on the surface of the sun Temperature at the center of the sun Temperature of the hottest star* Temperature of the sun's corona Curie temperature of iron Curie temperature of cobalt Curie temperature of nickel Curie temperature of gadolinium Highest critical temperature superconductor Ignition temperature of paper Ignition temperature of gasoline Ignition temperature of diesel fuel Melting point of butter Melting point of cocoa butter Melting point of glass Time (Age, Duration, Half‑life, Period)☝ Age of Homo sapiens Age of life on earth Age of the earth Age of the universe* Duration of the shortest laser pulse Duration of a sound bite Duration of the longest space flight Fingertip reaction time Half‑life of carbon‑14 Half‑life of plutonium‑239 How long do the subway doors stay open? Period between heartbeats Period of the human menstrual cycle Period of a pulsar Period of rotation of the earth Period of the moon's orbit Period of rotation of the sun Period of rotation of Venus Period of rotation of Pluto Period of the earth's orbit Period of the sun's orbit around the galaxy (cosmic year) Time spent driving to work Time spent at work Time spent sleeping Velocity (Speed)☝ Speed of a bacterium Speed of a protozoan Speed of a sperm cell* Speed of a snail* Speed of a sloth* Speed of a tortoise or turtle* Speed of a rabbit or hare Speed of a tuna Speed of a shark Speed of a dolphin Speed of a whale Speed of a cheetah* Speed of the fastest dog Speed of the fastest horse Speed of the fastest bird Speed of a Screaming Slingshot Monkey Speed of a human running: Is footwear a factor? Speed of a Retired Basketball Player: Charles Barkley and Dick Bavetta Speed of a football player: Madden NFL 2006 Speed of superhero: Smallville Speed of the fastest human, swimming* Speed of the fastest human, walking Speed of the fastest human, running* Speed of the fastest human, skating* Speed of the fastest human, cycling Speed of the fastest human, sledding Speed of the fastest human, skiing Speed of the fastest pitched baseball* Speed of the fastest pitched softball Speed of the fastest served tennis ball Speed of the fastest jai alai ball Speed of a dodge ball Speed of a golf ball Speed of a rogue bludger: Harry Potter Speed of a bowling ball Speed of the fastest badminton shuttlecock Speed of a spear: Troy Speed of a skydiver (terminal velocity)* Speed of the continental plates* Speed of seismic waves Speed of a tsunami Speed of a river Speed of ocean currents Speed of a falling snowflake Speed of a falling raindrop Speed of a falling hailstone Speed of falling Saruman: Lord of the Rings Speed of the winds in a hurricane Speed of the winds in a tornado Speed of nerve impulses Speed of sound in air Speed of sound in water Speed of sound through the earth Speed of video tape Speed of audio tape Speed of a phonograph record Speed of a CD Speed of a DVD Speed of a subway Speed of a subway: Batman Begins Speed of a commercial jet airplane Speed of a torpedo* Speed of a BB Speed of a paintball Speed of a bullet Speed of a cannonball Speed of an artillery shell Speed of a missile Speed of the fastest ship* Speed of the fastest train* Speed of the fastest motorcycle Speed of the fastest street legal car* Speed of a stock car Speed of a formula one car Speed of a dragster or funny car Speed of the fastest experimental car Speed of the fastest airplane* Speed needed to escape the earth (escape velocity) Speed of a space shuttle Speed of the Voyager space probes* Speed of the earth in orbit Speed of the sun Speed of the solar wind Speed of the Milky Way in space* Speed of light Speed of a car: Bad Boys II Speed of a car: The Blues Brothers Speed of a car: C'était un Rendezvous Speed of a car: The French Connection Speed of a car: Honda Civic Si commercial Speed of a car: Le Mans (Steve McQueen, 1971) Speed of a car: Road Trip Speed of a car: The Run Speed of a baseball: Bird Baseball Speed of a cliff diver: Huge Cliff Jump Speed of a cliff diver: Iraqi Olympic Diving Speed of a minibike: Jackass Number Two Speed of a motorcycle: Loading a Bike Speed of a snowmobile: Snow Jump Volume☝ Volume of a drop of water Volume of a human heart Volume of a human brain Volume of a human bladder Volume of a human stomach Volume of human lungs Volume of blood in a human* Volume of water consumed by New York City Volume of water consumed by the US Volume of bottled water consumption Volume of US soft drink consumption Volume of [US or world] milk consumption Volume of [US, British, or world] gin consumption Volume of vodka consumption Volume of US whiskey consumption Volume of US rum consumption Volume of world beer consumption Volume of a swimming pool Volume of water in New York City reservoirs Volume of water in US reservoirs Volume of New York City's annual precipitation* Volume of Seattle's annual precipitation Volume of earth's annual precipitation Volume of earth's lakes Volume of earth's rivers* Volume of earth's glaciers Volume of earth's polar ice caps* Volume of earth's groundwater Volume of earth's oceans* Volume of US petroleum production Volume of US petroleum consumption Volume of US petroleum reserves* Volume of world petroleum production Volume of world petroleum reserves * entries marked with an asterisk include editor's commentary accelerationa, angular‑velocityω, areaA, densityρ, dimensionD, electric‑currentI, electric‑fieldE, electric‑voltageV, electrical‑resistivityρ, energyE, forceF, frequencyf, frictionμ, lengthℓ, magnetic‑fieldB, massm, money$, number#, powerP, pressurep, refractionn, restitutioncor, temperatureT, timet, velocityv, volumeV