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Standard Units
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|||
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Unit
|
Symbol
|
Definition
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Comments
|
|
Time
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|||
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second
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sec
|
1 s
|
|
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minute
|
min
|
60 s
|
|
|
hour
|
hr
|
60 min
|
|
|
hour
|
hour
|
1 hr
|
alternate symbol
|
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hour
|
h
|
1 hr
|
alternate symbol
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day
|
day
|
24 hr
|
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shake
|
shake
|
10 ns
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|
|
Hertz
|
Hz
|
1 s^-1
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Length or Distance
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|||
|
international foot
|
ft
|
0.3048 m
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inch
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in
|
1.0/12.0 ft
|
|
|
international mile
|
mile
|
5280.0 ft
|
|
|
international mile
|
mi
|
1 mile
|
alternate symbol
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|
milli-inch
|
mil
|
0.001 in
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|
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Parsec
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pc
|
3.085678e16 m
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League
|
league
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3 mile
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Astronomical Unit
|
ua
|
1.49598e11 m
|
|
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Astronomical Unit
|
AU
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1.49598e11 m
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alternate symbol
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yard
|
yd
|
3 ft
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|
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Angstrom
|
Ang
|
1e-10 m
|
|
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Angstrom
|
\\AA
|
1 Ang
|
alternate symbol
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furlong
|
furlong
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220 yd
|
|
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fathom
|
fathom
|
6 ft
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Rod
|
rd
|
16.5 ft
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sft
|
(1200./3937.) m
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|
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smi
|
5280 sft
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also called statue mile
|
|
point
|
pt
|
1./72. in
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Typeface Point
|
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pica
|
pica
|
1./6. in
|
Typeface Pica
|
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Temperature
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Celsius
|
C
|
1 K -273.15
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Rankine
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R
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5.0/9.0 K
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Fahrenheit
|
F
|
1 R -459.67
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Mass
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gram
|
g
|
0.001 kg
|
This is case sensitive.
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|
gram
|
gm
|
g
|
(alternate symbol)
|
|
pound mass
|
lbm
|
0.45359237 kg
|
(avoirdupois)
|
|
Troy pound
|
lbt
|
0.3732417 kg
|
(apothecary)
|
|
carat (metric)
|
carat
|
0.2 g
|
|
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slug
|
slug
|
1 lb sec^2/ft
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snail
|
snail
|
1 lb sec^2/in
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|
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Short Ton
|
ton
|
2000 lbm
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|
|
Long Ton
|
ton_l
|
2240 lbm
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|
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Ounce
|
oz
|
28.34952 g
|
(avoirdupois)
|
|
Grain
|
gr
|
64.79891 mg
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Pennyweight
|
dwt
|
1.55174 g
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Force or Weight
|
|||
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N
|
1 kg m/s^2
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Dyne
|
dyn
|
1e-5 N
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pound force
|
lb
|
lbm G
|
|
|
pound force
|
lbf
|
lbm G
|
|
|
poundal
|
poundal
|
1 lbm ft/sec^2
|
|
|
kilopound
|
kip
|
1000 lbf
|
|
|
kilogram force
|
kgf
|
kg G
|
|
|
Energy
|
|||
|
Joule
|
J
|
1 N m
|
|
|
British Therm. Unit
|
BTU
|
1055.056 J
|
(International Table)
|
|
British Therm. Unit
|
Btu
|
1 BTU
|
alternate symbol
|
|
British Therm. Unit
|
BTU_th
|
1054.350 J
|
(Thermochemical)
|
|
calorie
|
cal
|
4.1868 J
|
(International Table)
|
|
calorie
|
cal_th
|
4.184 J
|
(Thermochemical)
|
|
Calorie
|
|
4.1868 kJ
|
(nutritionists)
|
|
electron volt
|
eV
|
1.602177e-19 J
|
|
|
erg
|
erg
|
1e-7 J
|
|
|
Ton of TNT
|
TNT
|
4.184e9 J
|
|
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Power
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|||
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Watt
|
W
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1 J/s
|
|
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Horse Power
|
hp
|
550 ft lb/s
|
|
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Pressure
|
|||
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bar
|
bar
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1e5 N/m^2
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|
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Pascal
|
Pa
|
1 N/m^2
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|
|
Pounds per sq. inch
|
psi
|
1 lb/in^2
|
|
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Pounds per sq. ft.
|
psf
|
1 lb/ft^2
|
|
|
kilo psi
|
ksi
|
1000.0 psi
|
|
|
atmospheres
|
atm
|
1.01325e5 N/m^2
|
|
|
inches of Mercury
|
inHg
|
3.387 kPa
|
|
|
millimeters Mercury
|
mmHg
|
0.1333 kPa
|
|
|
Torr
|
torr
|
1.333224 Pa
|
|
|
Volume or Area
|
|||
|
Liter
|
L
|
1/1000.0 m^3
|
|
|
gallon
|
gal
|
3.785412 L
|
|
|
Pint (
|
pint
|
1/8. gal
|
|
|
Quart (
|
qt
|
2 pint
|
|
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Pint (
|
dpint
|
0.5506105 L
|
|
|
Quart (
|
dqt
|
2 dpint
|
|
|
|
acre
|
1/640.0 smi^2
|
|
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Hectare
|
ha
|
10000 m^2
|
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|
Barrel (petroleum)
|
barrel
|
158.9873 L
|
|
|
Fluid Ounce
|
oz_fl
|
29.57353 mL
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|
|
Gill (
|
gi
|
0.1182941 L
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|
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Peck (
|
pk
|
8.809768 L
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|
|
Tablespoon
|
tbl
|
1/32. pint
|
|
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Teaspoon
|
tsp
|
1/3. tbl
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Cup
|
cup
|
16. tbl
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Electromagnetism
|
|||
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Coulomb
|
Co
|
1 A s
|
Electric Charge
|
|
Volt
|
V
|
1 W/A
|
Electric Potential
|
|
Ohm
|
ohm
|
1 V/A
|
Electric Resistance
|
|
Ohm
|
\\Omega
|
1 V/A
|
alternate symbol
|
|
Faraday
|
faraday
|
96485.31 Co
|
Electric Charge
|
|
Farad
|
farad
|
Co/V
|
Capacitance
|
|
Stokes
|
stokes
|
1e-4 m^2/s
|
|
|
Oersted
|
Oe
|
79.57747 A/m
|
|
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Webber
|
Wb
|
V s
|
Magnetic flux
|
|
Tesla
|
Tesla
|
Wb/m^2
|
Magnetic flux density
|
|
Henry
|
H
|
Wb/A
|
Inductance
|
|
Siemens
|
S
|
A/V
|
Electrical Conductance
|
|
Light and Radiation
|
|||
|
Lux
|
lux
|
cd/m^2
|
Iluminance
|
|
Lux
|
lx
|
cd/m^2
|
|
|
Lumen
|
lm
|
cd
|
Luminous Flux
|
|
Stilb
|
sb
|
10000 cd/m^2
|
|
|
Phot
|
ph
|
10000 lx
|
|
|
Becquerel
|
Bq
|
s^-1
|
activity
|
|
Gray
|
Gy
|
J/kg
|
Absorbed Dose, kerma
|
|
Sievert
|
Sv
|
J/kg
|
Dose equivalent
|
|
Other Quantities
|
|||
|
pound mole
|
lbmole
|
1 mol lbm/g
|
quantity
|
|
poise
|
poise
|
1 g /sec cm
|
viscocity
|
|
Gravity's accel.
|
G
|
9.80665 m/sec^2
|
Gravity on Earth
|
|
Degree
|
deg
|
Pi/180
|
Can be used to convert from
degrees to radians for trig functions.
|
|
Percent
|
%
|
0.01
|
|
|
Knot
|
knot
|
1852 m/hr
|
velocity
|
|
Miles per Hour
|
mph
|
1 mi/hr
|
velocity
|
|
Gallon/minute
|
gpm
|
1. gal/min
|
flow rate
|
|
Revolution/minute
|
rpm
|
360 deg/min
|
|
الأربعاء، 11 مارس 2015
Standard Units
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تعليقات الرسالة (Atom)
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