Unit
How to write units in this site (more)
A unit is written this way:
[prefix1] unit1 [exponent1] { [separator2] [prefix2] unit2 [exponent2] ...}
Where:
- separator is either " . " or " / "
- exponent is either " ² ", " ³ " or " ^ " followed by a number
- prefix is as defined below (case sensitive)
- unit is as defined below (case sensitive)
Example
Here are some of the possibilities to write pound per squared inch:
- psi
- lb/in²
- lb/in^2
- lb.in^-2
- lb/in/in
- lb.in/in³
- in^-2/lb^-1
Prefix
A prefix can be added to any defined unit. For example:
- mm → millimeter
- kpsi → kilopound per squared inch
- Mkg → megakilogram
- µµ → micromicron
- yLy → yoctolight-year
- aN/km/Gin → attonewton per kilometer per gigainch
Units used in this site (more)
| Type | Name | Symbol | value in SI | |||
| ---- | unity | 1 | 1 | |||
| length (base unit) | meter | m | 1 m | |||
| mass (base unit) | kilogram | kg | 1 kg | |||
| time (base unit) | second | s | 1 s | |||
| electric current (base unit) | ampere | A | 1 A | |||
| temperature (base unit) | kelvin | K | 1 K | |||
| amount of substance (base unit) | mole | mol | 1 mol | |||
| luminous intensity (base unit) | candela | cd | 1 cd | |||
| angle | radian | rad | 1 m/m | |||
| angle | degree | ° |
| |||
| angle | degree | deg |
| |||
| angle | revolution | rev | 2π m/m | |||
| angle | arcminute | ' |
| |||
| angle | arcsecond | " |
| |||
| angle | grad | gon |
| |||
| solid angle | steradian | sr | 1 m²/m² | |||
| time | minute | min | 60 s | |||
| time | hour | h | 3 600 s | |||
| time | day | d | 86 400 s | |||
| time | year | yr | 31 556 952 s | |||
| length | feet | ft | 0.3048 m | |||
| length | yard | yd | 0.914 4 m | |||
| length | mile | mi | 1 609.344 m | |||
| length | inch | in | 0.025 4 m | |||
| length | thou | mil | .000 025 4 m | |||
| length | micron | µ | 0.000 001 m | |||
| length | nautical mile | sm | 1 852 m | |||
| length | nautical mile | nmi | 1 852 m | |||
| length | light-year | Ly | 9 460 730 472 580 800 m | |||
| length | astronomic unit | AU | 149 597 871 464 m | |||
| length | point | p |
| |||
| area | acre | ac | 4046.856 422 4 m² | |||
| area | hectare | ha | 10 000 m² | |||
| area | circular inch | cir in | 0.000 161 29π m² | |||
| area | circular thou | cir mil | 0.000 000 000 161 29π m² | |||
| volume | cubic centimeter | cc | 0.000 001 m³ | |||
| volume | cubic inch | ci | (0.025 4)³ m³ | |||
| volume | liter | l | 0.001 m³ | |||
| volume | liter | L | 0.001 m³ | |||
| volume | gallon US | gal | 0.003 785 411 784 m³ | |||
| volume | quart US | qt | 0.000 946 352 946 m³ | |||
| volume | pint US | pt | 0.000 473 176 473 m³ | |||
| volume | fluid ounce US | fl oz | 0.000 029 573 529 562 5 m³ | |||
| volume | gallon imperial | gal Imp | 0.004 546 09 m³ | |||
| volume | quart imperial | qt Imp | 0.001 136 522 5 m³ | |||
| volume | pint imperial | pt Imp | 0.000 568 261 25 m³ | |||
| volume | fluid ounce imperial | fl oz Imp | 0.000 028 413 062 5 m³ | |||
| frequency | hertz | Hz | 1 1/s | |||
| frequency | revolution per minute | rpm |
| |||
| speed | knot | kn |
| |||
| speed | miles per hour | mph | 0.447 04 m/s | |||
| acceleration | standard gravity | G | 9.806 65 m/s² | |||
| mass | gram | g | 0.001 kg | |||
| mass | pound-mass | lbm | 0.453 592 37 kg | |||
| mass | kip | kip | 453.592 37 kg | |||
| mass | ounce | oz | 0.028 349 523 125 kg | |||
| mass | short ton | sh tn | 907.184 74 kg | |||
| mass | long ton | ton | 1 016.046 908 8 kg | |||
| mass | tonne | t | 1000 kg | |||
| mass | slug | slug |
| |||
| force | newton | N | 1 kg.m/s² | |||
| force | pound | lb | (9.806 65)(0.453 592 37) N | |||
| force | dyne | dyn | 0.000 01 N | |||
| force | kilogram-force | kgf | 9.806 65 N | |||
| force | kilogram-force | kp | 9.806 65 N | |||
| energy | joule | J | 1 kg.m²/s² | |||
| energy | British Thermal Unit | BTU | 1 055.056 J | |||
| energy | calorie | cal | 4.1868 J | |||
| energy | electron-volt | eV | 1.602 176 487 × 10−19 J | |||
| energy | celsius heat unit | CHU | 1 899.1 J | |||
| power | watt | W | 1 J/s | |||
| power | horsepower | hp | (550)(9.80665)(0.45359237)(0.3048) W | |||
| power | metric horsepower | PS | 735.498 75 W | |||
| pressure | pascal | Pa | 1 N/m² | |||
| pressure | atmosphere | atm | 101 325 Pa | |||
| pressure | bar | bar | 100 000 Pa | |||
| pressure | pound per squared inch | psi |
| |||
| pressure | torr | torr |
| |||
| pressure | millimeter of mercury | mmHg |
| |||
| pressure | millimeter of water | mmH2O | 9.8063754138 Pa | |||
| pressure | inch of mercury | inHg |
| |||
| pressure | inch of water | inH2O | 249.081 935 510 52 Pa | |||
| temperature | degree celsius | °C | 1 K | |||
| temperature | degree fahrenheit | °F |
| |||
| temperature | rankine | R |
| |||
| volumetric flow | cubic feet per minute | cfm | 0.000 471 947 443 2 m³/s | |||
| volumetric flow | gallon US per minute | gpm | 0.000 063 090 196 4 m³/s | |||
| electric charge | coulomb | C | 1 A.s | |||
| electric potential difference | volt | V | 1 W/A | |||
| capacitance | farad | F | 1 C/V | |||
| electric resistance | ohm | ohm | 1 V/A | |||
| electric conductivity | siemen | S | 1 A/V | |||
| dynamic viscosity | poise | P | 0.1 Pa.s | |||
| kinematic viscosity | stokes | St | 0.000 1 m²/s | |||
| magnetic flux | weber | Wb | 1 V.s | |||
| magnetic flux | maxwell | Mx | 0.000 000 01 Wb | |||
| inductance | henry | H | 1 V.s/A | |||
| magnetic flux density | tesla | T | 1 Wb/m² | |||
| luminous flux | lumen | lm | 1 cd.sr | |||
| illuminance | lux | lx | 1 lm/m² |
(detailed info)
Prefixes used in this site (more)
| Symbol | value |
| Y | 1024 |
| Z | 1021 |
| E | 1018 |
| P | 1015 |
| T | 1012 |
| G | 109 |
| M | 106 |
| k | 103 |
| h | 102 |
| d | 10−1 |
| c | 10−2 |
| m | 10−3 |
| µ | 10−6 |
| n | 10−9 |
| p | 10−12 |
| f | 10−15 |
| a | 10−18 |
| z | 10−21 |
| y | 10−24 |
(detailed info)
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