Conversions

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.

Architectural Acoustics

Decibel
The human ear responds logarithmically and it is convenient to deal in logarithmic units in audio systems.

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.
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.

Chemistry

Amagat
The unit of density of a gas at stp equal to 44.614774 molm-3.
C7H5N3O6
Chemical formula for Trinitrotoluene.
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 0R and the steam point is 80R.
TNT
Abbreviation of the explosive Trinitrotoluene.
Trinitrotoluene
Used as a high explosive and known as TNT.

Classical Mechanics

Acceleration
The change in velocity divided by the time it takes to make the change.
Angular Velocity
The rate of change of angle turned in radians.
Density
The derived SI unit of density is kgm-3
Linear Momentum
A vector quantity equal to the product of an object's mass and its velocity.
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.
Velocity
Velocity is a vector quantity that specifies the time rate of change of displacement with respect to a reference frame.

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

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.
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.

Engines

Fuel Consumption
Definitions of fuel consumption calculations.

Fluid Dynamics

Dynamic viscosity
That molecular property of a fluid which enables it to support tangential stresses for a finite time and thus to resist deformation.
Kinematic Viscosity
The dynamic viscosity of a fluid divided by the fluid density.
Pressure
Defined as the force exerted per unit area.
Viscosity
A measure of the internal friction within a fluid.

General

ac in
Abbreviation of acre inch, a volume one inch deep covering an area of one acre.
Bolt of Cloth
A standard unit of length used in the fabric industry.
Bottle
A unit of volume.
cm3
Abbreviation of Cubic Centimetre.
dwt
Abbreviation of pennyweight.
fl oz
Abbreviation of Fluid Ounce.
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.
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.
Quad
Unit of energy equivalent to 1e15 BTU.
sh cwt
Abbreviation of Short Hundredweight.
Short Hundredweight
Old imperial unit of weight, equal to 100lb.
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.
Tsi
Abbreviation of Tons per Square Inch.

Geometry

Angles
The inclination of one line to another.
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.

Heating Ventilation and Air Conditioning

British Thermal Unit
The amount of heat required to raise the temperature of 1 pound of water by 1° Fahrenheit.

Human Biology

Unit of Blood
Unit of volume for human blood and its components.

Materials

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

Mathematics

Hexadecimal
Counting system based on 16.
Point
A zero-dimensional figure.
Quart
A unit of volume.

Mechanical Engineering

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.
ch
Metric horsepower.
Cheval Vapeur
Metric horsepower.
Flow Rate
Volume per unit of time.
Grain
An individual crystal in a poly-crystalline metal or alloy.
Horsepower
Mechanical engineering unit of power.
hp
Mechanical engineering unit of power.
kilopond
Another name for kilogram force.
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.
Moments of Inertia
Principal axes for bodies of uniform density.
mpg
Abbreviation of mile per gallon.
P
The abbreviation of poise, the CGS derived unit of dynamic viscosity of a fluid.
Pressure
Defined as the force exerted per unit area.
Prony
Unit of power.
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.
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.
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.

Medical

Grain
An individual crystal in a poly-crystalline metal or alloy.

Meteorology

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.
Foot Candle
A measure of light intensity on a surface being illuminated.

Physics

Astronomical Unit
Defined as the mean distance of the Earth from the Sun.
Atmospheric Pressure
Atmospheric pressure is the force exerted by the weight of the atmosphere of the Earth at ground level.
Bushel
A dry or liquid measure equal to eight gallons.
Carat Precious Stones
A standard measure of weight for precious stones.
Chain
The chain is a unit of length.
Charge
The excess or deficiency of electrons resulting in the body having negative or positive charge.
Cord
An imperial unit of volume used mainly in the timber industry.
Curie
Unit of radioactivity equal to 3.7x1010Bequerels.
Energy
Energy is defined as the capacity of a body for doing work.
Fathom
An old unit of length more normally used to measure the depth of water.
Flow Rate
Volume per unit of time.
Force
A force is that which when acting on a body that is free to move accelerates the motion of the body.
Furlong
A distance of one-eight of a mile.
Gauss
A unit of magnetic field strength, 10-4 tesla.
Grain
An individual crystal in a poly-crystalline metal or alloy.
Hundredweight
Abbreviated as cwt, this is an imperial unit of mass.
Kelvin
The kelvin is the unit of thermodynamic temperature.
kilopond
Another name for kilogram force.
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.
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.
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.
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.
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.
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
Poundal
A derived unit of force in the British system of units.
Power
Power is defined as the rate of doing work.
Pressure
Defined as the force exerted per unit area.
Prony
Unit of power.
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 0R and the steam point is 80R.
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.
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.
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.
TOE
Abbreviation of the unit of energy Tonne of Oil Equivalent.
Tonne of Oil Equivalent
A unit of energy equal to 41.868 GJ

Thermodynamics

Chu
Abbreviation of centigrade heat unit.
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.
Kelvin
The kelvin is the unit of thermodynamic temperature.
Ton Refrigeration Unit
Unit which removes same amount of heat in 24 hours as melting of 1 ton of ice.

Trigonometry

Angles
The inclination of one line to another.
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.

Units

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.
ac ft
Abbreviation of acre foot, a volume one foot deep covering an area of one acre.
Acre
A British unit of area, traditionally used in agriculture.
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.
Ampere-Hour
An alternative unit of electrical charge.
Apothecaries Ounce
Once used as a measurement of weight for drugs and other medical substances.
Are
A derived SI Unit of area. 1 Are = 100m2
Area
The derived SI unit of area is the m2.
atm
An abbreviation of atmosphere.
bar
A derived unit of pressure used in meteorology. 1 bar = 1x105 Pa.
Barn
A unit of nuclear cross section, 1 Barn = 10-28m2.
Barrel
A unit of capacity in the oil industry.
Barye
The CGS unit of pressure, equal to 1 dyne per square centimetre.
Bcfe
Abbreviation of Billion Cubic Feet of Gas Equivalent.
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.
Billion Cubic Feet of Gas Equivalent
This is really an energy unit equal to about 1.091 petajoules (PJ).
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.
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.
Calorie per Second
Unit of power.
Candela
The SI unit of luminous intensity.
cc
Abbreviation of Cubic Centimetre.
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.
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 Centimetre
Abbreviated as cm3 or cc.
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.
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.
Dyne
A force of 1 dyne acting on a mass of 1g imparts an acceleration of 1cms-2.
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
Feet per Minute
Old imperial units of velocity, abbreviated as fpm or ft min-1.
Feet per Second Squared
Old imperial unit of acceleration.
Fluid Ounce
20 fluid ounces = 1 pint
Foot
One foot was defined as one third of the Imperial Standard yard.
Foot Candle
A measure of light intensity on a surface being illuminated.
Foot Pound
Imperial unit of mechanical energy.
ft lb
Abbreviation of foot pound, Imperial unit of mechanical energy.
ft min-1
Abbreviation of Feet per Minute.
ft2
Imperial unit of area.
ft3s-1
Cubic foot per second.
ft s-2
Abbreviation of Feet per Second Squared, an old imperial unit of acceleration.
Gallon
This unit of volume is defined in the British and American system of units. Note 1 UK gallon = 1.2 US gallons.
Gallons per Minute
Volume flow rate.
GPM
Abbreviation of Gallons per Minute.
gram
The CGS unit of mass equal to 10-3kg.
Hectare
An SI derived unit of area.
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.
kilo calories
1000 calories.
kilo pounds per square inch
A unit of pressure used in the imperial system of units.
Kilogram Force
Equivalent to the force exerted by 1 kilogram due to the local acceleration due to gravity.
kilojoule
One thousand joules.
kilometre
A length equal to 1000 metres.
Kilometres Per Hour
Unit of velocity used by most land based vehicles.
kiloWatt hour
Unit of energy equal to 3.6x106J.
kWh
Abbreviation of kiloWatt hour.
Litre
A derived SI unit of volume.
Litre Atmosphere
A unit of work or energy used in the study of confined gases.
MegaWatt hours
A unit of energy equal to 1,000,000 watts for one hour.
Metre
The metre is the SI unit of length.
millimetre
milli is the prefix representing a multiplication of 10-3 and metre is the SI unit of length.
Newton
The SI unit of force.
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.
Ounces
A secondary unit in the British system of units. 1 ounce (oz) = 28.34952 g
Poise
Named after the physicist Poiseuille this is the CGS derived unit of dynamic viscosity.
Pound Force Foot
The unit of torque in the old British system of units, abbreviated lbf ft.
Pounds per Square Inch
A British imperial unit of pressure. 1.0 psi = 6894.757 Pa
Slinch
Equal to 12 slugs, an old unit of mass.
Square Feet
Imperial unit of area.
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.
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.
Tons per Square Inch
Old imperial unit of pressure, abbreviated as Tsi or tonf in-2.
Troy Ounce
An old British unit of mass mainly used for measuring prescious metals. 1 troy ounce = 31.1035 g
Unit of Blood
Unit of volume for human blood and its components.
Watt Hour
A unit of energy equivalent to one watt of power expended for one hour of time.
Winchester Gallon
The US gallon, equivalent to 3.785411784 litres.
Yard
The yard was a unit of length of the British system of units.

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