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Aerodynamics: Flow Rate; Volume per unit of time.; Kinematic Viscosity; The dynamic viscosity of a fluid divided by the fluid density.; Mass Flow Rate; Defines the volumetric rate with which fluids flow, maintaining the equation of continuity.; Pressure; Defined as the force exerted per unit area.; Reyn; British unit of dynamic viscosity.; Viscosity; A measure of the internal friction within a fluid.

Architecture: Area; The derived SI unit of area is the m².

Astronomy: ly; Abbreviation of Light Year.

Audio: Decibel; The human ear responds logarithmically and it is convenient to deal in logarithmic units in audio systems.; Mel; A proportional scale, in which equal intervals correspond to equal perceived interval sizes.

Automotive: Brake Horse Power; This is the useful power available at the flywheel of an engine.; Fuel Consumption; Definitions of fuel consumption calculations.; Gallon; This unit of volume is defined in the British and American system of units. Note 1 UK gallon = 1.2 US gallons.; Litre; A derived SI unit of volume.; litres per 100km; Unit of fuel consumption used in the automotive industry.; mile per gallon; Fuel consumption.; Winchester Gallon; The US gallon, equivalent to 3.785411784 litres.

Biology: Unit of Blood; Unit of volume for human blood and its components.

Chemistry: Amagat; The unit of density of a gas at stp equal to 44.614774 molm^-3.; atm; An abbreviation of atmosphere.; ha; An abbreviation of hectare, a derived SI unit of area that is mainly used in agriculture to describe the area of fields.; kJ; An abbreviation of kilojoule, one thousand joules. The SI unit of energy is the joule.; Rankine Temperature Scale; An absolute scale of temperature based on degrees Farenheit.; Reaumur Temperature Scale; On the Reaumur temperature scale, abbreviated to R, the ice point is 0°R and the steam point is 80°R.

Computing: Hexadecimal; Counting system based on 16.; Unsigned Binary Number; A binary number in which all the bits are used to represent positive quantities.

Electronics: Abampere; The CGS electromagnetic unit of current equal to 10 Amperes.; Abcoulomb; The CGS unit of electric charge equal to 10 Coulomb.; Abhenry; The CGS unit of inductance equal to 1.0x10^-9Henry.; Abmho; The CGS unit that is the reciprocal of the ohm equal to 1.0x10⁹Siemens.; Abohm; The CGS unit of electrical resistance equal to 1.0x10^-9Ohms.; Abvolt; The CGS unit of electromotive force equal to 1.0x10^-9Volt.; B; An abbreviation of bel, the logarithm of the ratio of two powers. The decibel is one tenth of a bel.; bel; The bel is the logarithm of the ratio of two powers, and the decibel is one tenth of a bel.; Statampere; The unit ofcurrent in the obsolete electrostatic system of units.; Statfarad; The unit of capacitance in the obsolete electrostatic system of units.; Stathenry; The unit of inductance in the obsolete electrostatic system of units.; Statvolt; The unit of electromotive force in the obsolete electrostatic system of units.; Statwatt; The unit of power in the obsolete electrostatic system of units.

General: ac ft; Abbreviation of acre foot, a volume one foot deep covering an area of one acre.; ac in; Abbreviation of acre inch, a volume one inch deep covering an area of one acre.; Acre Foot; A volume one foot deep covering an area of one acre.; Acre Inch; A volume one inch deep covering an area of one acre.; Bottle; A unit of volume.; Btu; Abbreviation of British Thermal Unit.; cc; Abbreviation of Cubic Centimetre.; cm³; Abbreviation of Cubic Centimetre.; Cubic Centimetre; Abbreviated as cm³ or cc.; dwt; Abbreviation of pennyweight.; Feet per Minute; Old imperial units of velocity, abbreviated as fpm or ft min^-1.; fl oz; Abbreviation of Fluid Ounce.; ft min^-1; Abbreviation of Feet per Minute.; gram; The CGS unit of mass equal to 10^-3kg.; Hand; Unit of measure. Used for measuring the height of a horse.; kCal; The calorific value of food and values presented on diet sheets are normally in kCal.; kilo calories; 1000 calories.; kilo pounds per square inch; A unit of pressure used in the imperial system of units.; kilojoule; One thousand joules.; kip; Abbreviation of kilo pounds force.; ksi; Abbreviation for kilo pounds per square inch.; League; An old imperial unit of distance.; Linear Density; Mass per unit length.; Metric Ton; Through common usage the 1000kg has been named the Tonne.; Nautical Chain; A unit of length equal to 15 feet.; Ounce Force; A derived unit of force in the British system of units.; Quad; Unit of energy equivalent to 1e15 BTU.; sh cwt; Abbreviation of Short Hundredweight.; Short Hundredweight; Old imperial unit of weight, equal to 100lb.; Slinch; Equal to 12 slugs, an old unit of mass.; tnf; Abbreviation for ton force, 1 tnf=9964.02 N.; Ton Force; 1 ton-force = 9964.02 N; tonf; Abbreviation for ton force, 1 tonf=9964.02 N.; tonf in^-2; Abbreviation of Tons per Square Inch.; Tons per Square Inch; Old imperial unit of pressure, abbreviated as Tsi or tonf in^-2.; Tsi; Abbreviation of Tons per Square Inch.; Winchester Gallon; The US gallon, equivalent to 3.785411784 litres.

Mathematics: Hexadecimal; Counting system based on 16.; Plane Angle; The plane angle between two radii of a circle which cut off on the circumference an arc equal in length to the radius is 1 radian.; Point; A zero-dimensional figure.; Quart; A unit of volume.; Radian; The radian is the plane angle between two radii of a circle which cut off on the circumference an arc equal in length to the radius.

Mechanical Engineering: atm; An abbreviation of atmosphere.; Barrel; A unit of capacity in the oil industry.; Barye; The CGS unit of pressure, equal to 1 dyne per square centimetre.; bbl; Abbreviation of barrel. A unit of capacity in the oil industry.; BHP; Abbreviation of Brake Horse Power, the useful power available at the flywheel of an engine.; Brake Horse Power; This is the useful power available at the flywheel of an engine.; British Thermal Unit; The amount of heat required to raise the temperature of 1 pound of water by 1° Fahrenheit.; Btu; Abbreviation of British Thermal Unit.; Centigrade Heat Unit; The amount of heat necessary to raise one pound weight of water through 1° C.; centipoise; One hundredth of a poise, the CGS derived unit of dynamic viscosity of a fluid.; ch; Metric horsepower.; Cheval Vapeur; Metric horsepower.; Chu; Abbreviation of centigrade heat unit.; cP; An abbreviation of centipoise, one hundredth of a poise. The CGS derived unit of dynamic viscosity of a fluid.; Cubic Foot per Minute; British imperial unit of flow rate.; Cubic Foot per Second; British imperial unit of flow rate.; cufm; Cubic foot per minute, a British imperial unit of flow rate.; Decibel; The human ear responds logarithmically and it is convenient to deal in logarithmic units in audio systems.; Dynamic viscosity; That molecular property of a fluid which enables it to support tangential stresses for a finite time and thus to resist deformation.; Feet per Second Squared; Old imperial unit of acceleration.; Flow Rate; Volume per unit of time.; Foot Pound; Imperial unit of mechanical energy.; ft lb; Abbreviation of foot pound, Imperial unit of mechanical energy.; ft³s^-1; Cubic foot per second.; ft s^-2; Abbreviation of Feet per Second Squared, an old imperial unit of acceleration.; Fuel Consumption; Definitions of fuel consumption calculations.; Grain; An individual crystal in a poly-crystalline metal or alloy.; Horsepower; Mechanical engineering unit of power.; hp; Mechanical engineering unit of power.; kilo pounds per square inch; A unit of pressure used in the imperial system of units.; kilopond; Another name for kilogram force.; Kinematic Viscosity; The dynamic viscosity of a fluid divided by the fluid density.; kip; Abbreviation of kilo pounds force.; kJ; An abbreviation of kilojoule, one thousand joules. The SI unit of energy is the joule.; kp; Abbreviation of kilopond, another name for kilogram force.; ksi; Abbreviation for kilo pounds per square inch.; l; The abbreviation of litre, a derived SI unit of volume.; Mass; The SI unit of mass is the kilogram.; mil; One thousandth (0.001) of an inch.; mile per gallon; Fuel consumption.; Moments of Inertia; Principal axes for bodies of uniform density.; mpg; Abbreviation of mile per gallon.; Newton Metre; The SI unit of Torque.; Nm; Abbreviation of newton metre, the SI unit of Torque.; Ounce Force; A derived unit of force in the British system of units.; P; The abbreviation of poise, the CGS derived unit of dynamic viscosity of a fluid.; Poise; Named after the physicist Poiseuille this is the CGS derived unit of dynamic viscosity.; Pressure; Defined as the force exerted per unit area.; PS; Metric horsepower; Quart; A unit of volume.; Revolutions per Minute; Unit to describe the rate of rotation of a body.; Revolutions per Second; Unit to describe the rate of rotation of a body.; Reyn; British unit of dynamic viscosity.; rpm; Abbreviation of revolutions per minute.; rps; Abbreviation of revolutions per second.; Statwatt; The unit of power in the obsolete electrostatic system of units.; Sthene; The unit of force in the metre-tonne-second system.; Stiffness; Stiffness is the ratio of change of force (or torque) to the corresponding change in translation (or rotational) deflection of an elastic element.; Thou; An abbreviation of thousandths of an inch. A unit of length used by engineers.; Ton Force; 1 ton-force = 9964.02 N; tonf in^-2; Abbreviation of Tons per Square Inch.; Tons per Square Inch; Old imperial unit of pressure, abbreviated as Tsi or tonf in^-2.; Torque; The torque or turning moment acting on a body is defined as the product of the magnitude of the force and the perpendicular distance of the line of action of the force from the axis about which the body is being rotated.; Torque to Power; Calculate power in PS given a torque in Nm at a given speed.; Tsi; Abbreviation of Tons per Square Inch.; Viscosity; A measure of the internal friction within a fluid.

Medical: Apothecaries Ounce; Once used as a measurement of weight for drugs and other medical substances.; Grain; An individual crystal in a poly-crystalline metal or alloy.

Meteorology: Celsius Temperature Scale; The centigrade scale of temperature was defined as 0°C at the ice point of water and as 100°C at the boiling point of water (at 1 standard atmosphere).; Temperature; A measure as to whether two bodies are hot or cold relative to one another.

Noise & Vibration: B; An abbreviation of bel, the logarithm of the ratio of two powers. The decibel is one tenth of a bel.; bel; The bel is the logarithm of the ratio of two powers, and the decibel is one tenth of a bel.; Decibel; The human ear responds logarithmically and it is convenient to deal in logarithmic units in audio systems.; Mel; A proportional scale, in which equal intervals correspond to equal perceived interval sizes.; Pascal; The SI derived unit of pressure.; Pressure; Defined as the force exerted per unit area.; Stiffness; Stiffness is the ratio of change of force (or torque) to the corresponding change in translation (or rotational) deflection of an elastic element.

Optics: Candela; The SI unit of luminous intensity.; cd; An abbreviation of candela, the SI unit of luminous intensity.

Physics: Abampere; The CGS electromagnetic unit of current equal to 10 Amperes.; Abcoulomb; The CGS unit of electric charge equal to 10 Coulomb.; Abhenry; The CGS unit of inductance equal to 1.0x10^-9Henry.; Abmho; The CGS unit that is the reciprocal of the ohm equal to 1.0x10⁹Siemens.; Abohm; The CGS unit of electrical resistance equal to 1.0x10^-9Ohms.; abtesla; The CGS unit of magnetic flux density equal to 10^-4 tesla.; Abvolt; The CGS unit of electromotive force equal to 1.0x10^-9Volt.; abwatt; The CGS unit of power equal to 10^-7 watt.; abweber; The CGS unit of magnetic flux equal to 10^-8 weber. Also known as the maxwell.; Acceleration; The change in velocity divided by the time it takes to make the change.; Acre; A British unit of area, traditionally used in agriculture.; Ampere-Hour; An alternative unit of electrical charge.; Angular Velocity; The rate of change of angle turned in radians.; Are; A derived SI Unit of area. 1 Are = 100m²; Area; The derived SI unit of area is the m².; Astronomical Unit; Defined as the mean distance of the Earth from the Sun.; atm; An abbreviation of atmosphere.; Atmospheric Pressure; Atmospheric pressure is the force exerted by the weight of the atmosphere of the Earth at ground level.; Barn; A unit of nuclear cross section, 1 Barn = 10^-28m².; Barye; The CGS unit of pressure, equal to 1 dyne per square centimetre.; Becquerel; The Becquerel is a unit used to measure a radioactivity. One Becquerel is that quantity of a radioactive material that will have 1 transformations in one second.; British Thermal Unit; The amount of heat required to raise the temperature of 1 pound of water by 1° Fahrenheit.; Bushel; A dry or liquid measure equal to eight gallons.; Cable Length; Originally the length of a ship′s anchor cable, 120 fathoms.; cal; An abbreviation of calorie, a unit of energy in the British system of units.; Calorie; A unit of energy in the British system of units. Still used to define the amount of energy amount of energy contained in foods.; Candela; The SI unit of luminous intensity.; Carat Precious Stones; A standard measure of weight for precious stones.; cd; An abbreviation of candela, the SI unit of luminous intensity.; Celsius Temperature Scale; The centigrade scale of temperature was defined as 0°C at the ice point of water and as 100°C at the boiling point of water (at 1 standard atmosphere).; Centigrade; The centigrade scale of temperature was defined as 0°C at the ice point of water and as 100°C at the boiling point of water (at 1 standard atmosphere).; Centigrade Heat Unit; The amount of heat necessary to raise one pound weight of water through 1° C.; Centimetre; The centimetre is a unit of length and is one hundredth of a metre by definition.; centipoise; One hundredth of a poise, the CGS derived unit of dynamic viscosity of a fluid.; Chain; The chain is a unit of length.; Charge; The excess or deficiency of electrons resulting in the body having negative or positive charge.; Chu; Abbreviation of centigrade heat unit.; Cord; An imperial unit of volume used mainly in the timber industry.; cP; An abbreviation of centipoise, one hundredth of a poise. The CGS derived unit of dynamic viscosity of a fluid.; Cubic Foot; 1 cubic foot = 0.0283168 m³; Cubic Foot per Minute; British imperial unit of flow rate.; Cubic Foot per Second; British imperial unit of flow rate.; Cubic Inch; The cubic inch has traditionally been used in American to define the swept volume of internal combustion engines.; Cubic Yard; 1 cubic yard = 0.764555 m³; Cubit; Unit of length equal to 457.2x10^-3m.; cufm; Cubic foot per minute, a British imperial unit of flow rate.; Curie; Unit of radioactivity equal to 3.7x10¹⁰Bequerels.; cwt; Abbreviation of hundredweight, this is an imperial unit of mass.; Decibel; The human ear responds logarithmically and it is convenient to deal in logarithmic units in audio systems.; Denier; A unit used in measuring the thickness (fineness) of yarn. It is the mass in grams of 9000m of yarn.; Density; The derived SI unit of density is kgm^-3; Dynamic viscosity; That molecular property of a fluid which enables it to support tangential stresses for a finite time and thus to resist deformation.; Dyne; A force of 1 dyne acting on a mass of 1g imparts an acceleration of 1cms^-2.; Energy; Energy is defined as the capacity of a body for doing work.; Erg; Unit of energy equal to 100.0x10^-9J.; Fahrenheit; On the Fahrenheit scale 0°C = 32°F and 100°C = 212°F; Faraday; Quantity of electrical charge associated with one mole of chemical charge equal to 96485.3C; Fathom; An old unit of length more normally used to measure the depth of water.; Feet per Second Squared; Old imperial unit of acceleration.; Flow Rate; Volume per unit of time.; Fluid Ounce; 20 fluid ounces = 1 pint; Foot; One foot was defined as one third of the Imperial Standard yard.; Force; A force is that which when acting on a body that is free to move accelerates the motion of the body.; ft³s^-1; Cubic foot per second.; ft s^-2; Abbreviation of Feet per Second Squared, an old imperial unit of acceleration.; Furlong; A distance of one-eight of a mile.; Gallon; This unit of volume is defined in the British and American system of units. Note 1 UK gallon = 1.2 US gallons.; Gauss; A unit of magnetic field strength, 10^-4 tesla.; Grain; An individual crystal in a poly-crystalline metal or alloy.; Heat Content; The SI unit for heat content is the Joule per cubic metre.; Heat Flow Rate; The SI unit of heat flow rate or power is the watt.; Hectare; An SI derived unit of area.; Hundredweight; Abbreviated as cwt, this is an imperial unit of mass.; Inches; A secondary unit in the British system of units, now replaced by the SI system and the metre.; Joule; The SI unit of energy.; Kelvin; The kelvin is the unit of thermodynamic temperature.; Kilogram Force; Equivalent to the force exerted by 1 kilogram due to the local acceleration due to gravity.; Kilometres Per Hour; Unit of velocity used by most land based vehicles.; kilopond; Another name for kilogram force.; Kinematic Viscosity; The dynamic viscosity of a fluid divided by the fluid density.; kJ; An abbreviation of kilojoule, one thousand joules. The SI unit of energy is the joule.; Knot; A speed of 1 nautical mile per hour.; kp; Abbreviation of kilopond, another name for kilogram force.; kph; Abbreviation of kilometres per hour, a unit of velocity used by most land based vehicles.; l; The abbreviation of litre, a derived SI unit of volume.; lbf; Abbreviation of pound-force = 4.44822 N; Leak Rate; The rate of gas leakage into or out of a system.; Length; The SI unit of length is the metre.; Light Year; The light year is defined as the distance travelled by electromagnetic radiation in one tropical year.; Linear Momentum; A vector quantity equal to the product of an object's mass and its velocity.; Litre; A derived SI unit of volume.; Lunar Month; 1 lunar month = 2.551444x10⁶s; ly; Abbreviation of Light Year.; Mass; The SI unit of mass is the kilogram.; Mass Flow Rate; Defines the volumetric rate with which fluids flow, maintaining the equation of continuity.; maxwell; The CGS unit of magnetic flux, equal to 1x10^-8weber.; Megaparsec; One million parsecs.; Metre; The metre is the SI unit of length.; Micron; A derived SI Unit of length equal to 10^-6m; Mile; A unit of distance most commonly used in Britain and the US.; Miles Per Hour; Traditional British unit of velocity used by land based vehicles.; millimetre; milli is the prefix representing a multiplication of 10^-3 and metre is the SI unit of length.; Moments of Inertia; Principal axes for bodies of uniform density.; Mpa; Abbreviation of megapascal.; Mpc; Abbreviation of Megaparsec, one million parsecs.; Nautical Mile; The average distance on the earth's surface subtended by one minute of latitude.; Newton; The SI unit of force.; Ounces; A secondary unit in the British system of units. 1 ounce (oz) = 28.34952 g; P; The abbreviation of poise, the CGS derived unit of dynamic viscosity of a fluid.; Parsec; 1 Parsec = 3.2615 Light Years; Pascal; The SI derived unit of pressure.; Pennyweight; An old unit of mass equal to 24 grains.; Pint; A derived British unit of volume.; Poise; Named after the physicist Poiseuille this is the CGS derived unit of dynamic viscosity.; Pole; An old English unit of length or the coldest regions on a planet.; Pound; The unit of mass in the British system of units.; Pound Force; pound-force (lbf) = 4.44822 N; Pound Force Foot; The unit of torque in the old British system of units, abbreviated lbf ft.; Poundal; A derived unit of force in the British system of units.; Pounds per Square Inch; A British imperial unit of pressure. 1.0 psi = 6894.757 Pa; Power; Power is defined as the rate of doing work.; Pressure; Defined as the force exerted per unit area.; Quintal; A hundredweight in the metric system, 100kg.; Radian; The radian is the plane angle between two radii of a circle which cut off on the circumference an arc equal in length to the radius.; Rankine Temperature Scale; An absolute scale of temperature based on degrees Farenheit.; Reaumur Temperature Scale; On the Reaumur temperature scale, abbreviated to R, the ice point is 0°R and the steam point is 80°R.; Revolutions per Minute; Unit to describe the rate of rotation of a body.; Revolutions per Second; Unit to describe the rate of rotation of a body.; Reyn; British unit of dynamic viscosity.; Rod; An old English unit of length.; rpm; Abbreviation of revolutions per minute.; rps; Abbreviation of revolutions per second.; Scruple; An old unit of weight.; Shed; A unit of nuclear cross-section.; Statampere; The unit ofcurrent in the obsolete electrostatic system of units.; Statcoulomb; The unit of charge in the obsolete electrostatic system of units.; Statfarad; The unit of capacitance in the obsolete electrostatic system of units.; Stathenry; The unit of inductance in the obsolete electrostatic system of units.; Statmho; The unit of conductane in the obsolete electrostatic system of units.; Statohm; The unit of resistance in the obsolete electrostatic system of units.; Statute Mile; A unit of distance most commonly used in Britain and the US.; Statvolt; The unit of electromotive force in the obsolete electrostatic system of units.; Sthene; The unit of force in the metre-tonne-second system.; Tablespoon; A convenient unit of capacity.; Teaspoon; A convenient unit of capacity.; Temperature; A measure as to whether two bodies are hot or cold relative to one another.; Torque; The torque or turning moment acting on a body is defined as the product of the magnitude of the force and the perpendicular distance of the line of action of the force from the axis about which the body is being rotated.; Viscosity; A measure of the internal friction within a fluid.; Yard; The yard was a unit of length of the British system of units.