SI units
Physical quantity | Name | Symbol |
---|---|---|
*dimensionless units | ||
length | metre | m |
mass | kilogram | kg |
time | second | s |
electric current | ampere | A |
thermodynamic temperature | kelvin | K |
luminous intensity | candela | cd |
amount of substance | mole | mol |
*plane angle | radian | rad |
*solid angle | steradian | sr |
Physical quantity | Name of SI unit | Symbol of SI unit | |
---|---|---|---|
frequency | hertz | Hz | |
energy | joule | J | |
force | newton | N | |
power | watt | W | |
pressure | pascal | Pa | |
electric | charge | coulomb | C |
electric potential difference | volt | V | |
electric resistance | ohm | Ω | |
electric conductance | siemens | S | |
electric capacitance | farad | F | |
magnetic flux | weber | Wb | |
inductance | henry | H | |
magnetic flux density (magnetic induction) | tesla | T | |
luminous flux | lumen | lm | |
illuminance | lux | lx | |
absorbed dose | gray | Gy | |
activity | becquerel | Bq | |
dose equivalent | sievert | Sv |
Submultiple | Prefix | Symbol | Multiple | Prefix | Symbol |
---|---|---|---|---|---|
10−1 | deci | d | 10 | deca | da |
10−2 | centi | c | 102 | hecto | h |
10−3 | milli | m | 103 | kilo | k |
10−6 | micro | μ | 106 | mega | M |
10−9 | nano | n | 109 | giga | G |
10−12 | pico | p | 1012 | tera | T |
10−15 | femto | f | 1015 | peta | P |
10−18 | atto | a | 1018 | exa | E |
10−21 | zepto | z | 1021 | zetta | Z |
10−24 | yocto | y | 1024 | yotta | Y |
From | To | Multiply by |
---|---|---|
in | m | 2.54 × 10−2 |
ft | m | 0.3048 |
sq. in | m2 | 6.4516 × 10−4 |
sq. ft | m2 | 9.2903 × 10−2 |
cu. in | m3 | 1.63871 × 10−5 |
cu. ft | m3 | 2.83168 × 10−2 |
l(itre) | m3 | 10−3 |
gal(lon) | l(itre) | 4.546 09 |
miles/hr | m s−1 | 0.477 04 |
km/hr | m s−1 | 0.277 78 |
lb | kg | 0.453 592 |
g cm−3 | kg m−3 | 103 |
lb/in3 | kg m−3 | 2.767 99 × 104 |
dyne | N | 10−5 |
poundal | N | 0.138 255 |
lbf | N | 4.448 22 |
mmHg | Pa | 133.322 |
atmosphere | Pa | 1.013 25 × 105 |
hp | W | 745.7 |
erg | J | 10−7 |
eV | J | 1.602 10 × 10−19 |
kW h | J | 3.6 × 106 |
cal | J | 4.1868 |
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SI units
Physical quantity | Name of unit | Symbol for unit |
---|---|---|
length | metre | m |
mass | kilogram | kg |
time | second | s |
electric current | ampere | A |
thermodynamic temperature | kelvin | K |
luminous intensity | candela | cd |
amount of substance | mole | mol |
*plane angle | radian | rad |
*solid angle | steradian | sr |
*supplementary units |
Physical quantity | Name of unit | Symbol for unit |
---|---|---|
frequency | hertz | Hz |
energy | joule | J |
force | newton | N |
power | watt | W |
pressure | pascal | Pa |
electric charge | coulomb | C |
electric potential difference | volt | V |
electric resistance | ohm | Ω |
electric conductance | siemens | S |
electric capacitance | farad | F |
magnetic flux | weber | Wb |
inductance | henry | H |
magnetic flux density (magnetic induction) | tesla | T |
luminous flux | lumen | lm |
illuminance (illumination) | lux | lx |
absorbed dose | gray | Gy |
activity | becquerel | Bq |
dose equivalent | sievert | Sv |
Submultiple | Prefix | Symbol | Multiple | Prefix | Symbol |
---|---|---|---|---|---|
10−1 | deci | d | 101 | deca | da |
10−2 | centi | c | 102 | hecto | h |
10−3 | milli | m | 103 | kilo | k |
10−6 | micro | μ | 106 | mega | M |
10−9 | nano | n | 109 | giga | G |
10−12 | pico | p | 1012 | tera | T |
10−15 | femto | f | 1015 | peta | P |
10−16 | atto | a | 1016 | exa | E |
10−21 | zepto | z | 1021 | zetta | Z |
10−24 | yocto | y | 1024 | yotta | Y |
From | To | Multiply by |
---|---|---|
Temperature conversion | ||
°C (Celsius) = 5/9(°F − 32) | ||
°F (Fahrenheit) = (9/5 × °C) + 32 | ||
in | m | 0.0254 |
ft | m | 0.3048 |
sq in | m2 | 0.00064516 |
sq ft | m2 | 0.092903 |
cu in | m3 | 0.0000164 |
cu ft | m3 | 0.0283168 |
l(itre) | m3 | 0.001 |
gal(lon) | m3 | 0.0045609 |
gal(lon) | litres | 4.5609 |
lb | kg | 0.453592 |
g cm−3 | kg m−3 | 1000 |
lb/in3 | kg m−3 | 27679.9 |
mmHg | Pa | 133.322 |
cal | J | 4.1868 |
m | in | 39.3701 |
cm | in | 0.393701 |
cm2 | sq in | 0.155 |
m2 | sq in | 1550 |
m2 | sq ft | 10.7639 |
m3 | cu in | 61023.6 |
m3 | cu ft | 35.3146 |
m3 | l(itre) | 1000 |
m3 | gal(lon) | 219.969 |
kg | lb | 2.20462 |
kg m−3 | g cm−3 | 0.001 |
kg m−3 | lb/in3 | 0.0000363 |
Pa | mmHg | 0.0075006 |
J | cal | 0.238846 |
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SI units
Quantity | Name of unit | Symbol | Equivalent | Reciprocal |
---|---|---|---|---|
length | metre | m | 3.281 feet | 1 ft = 0.3048 m |
mass | kilogram | kg | 2.2 pounds | 1 lb = 0.454 kg |
time | second | s | ||
electric current | ampere | A | ||
thermodynamic temperature | kelvin | K | 1°C = 1.8°F | 1°C = 1 K |
luminous intensity | candela | cd | ||
amount of substance | mole | mol |
Quantity | Unit | Symbol |
---|---|---|
plane angle | radian | rad |
solid angle | steradian | sr |
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SI units
Quantity | Name of unit | Symbol | Equivalent | Reciprocal |
---|---|---|---|---|
length | metre | m | 3.281 feet | 1 ft = 0.3048 m |
mass | kilogram | kg | 2.2 pounds | 1 lb = 0.454 kg |
time | second | s | ||
electric current | ampere | A | ||
thermodynamic temperature | kelvin | K | 1°C = 1.8°F | 1°C = 1 K |
luminous intensity | candela | cd | ||
amount of substance | mole | mol |
Quantity | Unit | Symbol |
---|---|---|
plane angle | radian | rad |
solid angle | steradian | sr |
Quantity | Name of unit | Symbol | Equivalent | Reciprocal |
---|---|---|---|---|
frequency | hertz | Hz | ||
energy | joule | J | 0.2388 calories | 1 cal = 4.1868 J |
force | newton | N | 0.225 pounds force | 1 lbf = 4.448 N |
power | watt | W | 0.00134 horse power | 1 hp = 745.7 W |
pressure | pascal | Pa | 0.00689 pounds force/sq.inch | 1 lbf/sq.in = 145 Pa |
electric charge | coulomb | C | ||
electric potential difference | volt | V | ||
electric resistance | ohm | Ω | ||
electric conductance | siemens | S | ||
electric capacitance | farad | F | ||
magnetic flux | weber | Wb | ||
inductance | henry | H | ||
magnetic flux density | tesla | T | ||
luminous flux | lumen | lm | ||
illuminance | lux | lx | ||
absorbed dose | gray | Gy | ||
activity | becquerel | Bq | ||
dose equivalent | sievert | Sv |
Name of multiple | Symbol | Value (multiply by) |
---|---|---|
atto | a | 10−18 |
femto | f | 10−15 |
pico | p | 10−12 |
nano | n | 10−9 |
micro | μ | 10−6 |
milli | m | 10−3 |
centi | c | 10−2 |
deci | d | 10−1 |
deca | da | 10 |
hecto | h | 102 |
kilo | k | 103 |
mega | M | 106 |
giga | G | 109 |
tera | T | 1012 |
peta | P | 1015 |
exa | E | 1018 |
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"SI units." A Dictionary of Plant Sciences. . Encyclopedia.com. 26 Apr. 2018 <http://www.encyclopedia.com>.
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SI units
Quantity | Name of unit | Symbol | Equivalent | Reciprocal |
---|---|---|---|---|
length | metre | m | 3.281 feet | 1 ft = 0.3048 m |
mass | kilogram | kg | 2.2 pounds | 1 lb = 0.454 kg |
time | second | s | ||
electric current | ampere | A | ||
thermodynamic temperature | kelvin | K | 1°C = 1.8°F | 1°C = 1 K |
luminous intensity | candela | cd | ||
amount of substance | mole | mol |
Quantity | Unit | Symbol |
---|---|---|
plane angle | radian | rad |
solid angle | steradian | sr |
Quantity | Name of unit | Symbol | Equivalent | Reciprocal |
---|---|---|---|---|
frequency | hertz | Hz | ||
energy | joule | J | 0.2388 calories | 1 cal = 4.1868 J |
force | newton | N | 0.225 pounds force | 1 lbf = 4.448 N |
power | watt | W | 0.00134 horse power | 1 hp = 745.7 W |
pressure | pascal | Pa | 0.00689 pounds force/sq.inch | 1 lbf/sq.in = 145 Pa |
electric charge | coulomb | C | ||
electric potential difference | volt | V | ||
electric resistance | ohm | Ω | ||
electric conductance | siemens | S | ||
electric capacitance | farad | F | ||
magnetic flux | weber | Wb | ||
inductance | henry | H | ||
magnetic flux density | tesla | T | ||
luminous flux | lumen | lm | ||
illuminous | lux | lx | ||
absorbed dose | gray | Gy | ||
activity | becquerel | Bq | ||
dose equivalent | sievert | Sv |
Name of multiple | Symbol | Value (multiply by) |
---|---|---|
atto | a | 10−18 |
femto | f | 10−15 |
pico | p | 10−12 |
nano | n | 10−9 |
micro | μ | 10−6 |
milli | m | 10−3 |
centi | c | 10−2 |
deci | d | 10−1 |
deca | da | 10 |
hecto | h | 102 |
kilo | k | 103 |
mega | M | 106 |
giga | G | 109 |
tera | T | 1012 |
peta | P | 1015 |
exa | E | 1018 |
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"SI units." A Dictionary of Zoology. . Encyclopedia.com. 26 Apr. 2018 <http://www.encyclopedia.com>.
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SI units
Measurement | Unit | Symbol |
---|---|---|
Basic units | ||
Length | metre | m |
Mass | kilogram | kg |
Time | second | s |
Electric current | ampere | A |
Thermodynamic temperature | kelvin | K |
Amount of substance | mole | mol |
Luminous intensity | candela | cd |
Supplementary units | ||
Plane angle | radian | rad |
Solid angle | steradian | sr |
Derived units | ||
Frequency | hertz | Hz |
Force | newton | N |
Pressure, stress | pascal | Pa |
Work (energy, heat) | joule | J |
Power | watt | W |
Electric charge | coulomb | C |
Electromotive force | volt | V |
Electric resistance | ohm | 1/2 |
Electric conductance | siemens | S |
Electric capacitance | farad | F |
Inductance | henry | H |
Magnetic flux | weber | Wb |
Magnetic flux density | tesla | T |
Illuminance | lux | lx |
Luminous flux | lumen | lm |
Radiation exposure | röntgen | r |
Radiation activity | becquerel | Bq |
Radiation absorbed dose | gray | Gy |
Radiation dose equivalent | sievert | Sv |
Celsius temperature | °Celsius | °C |
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SI units
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