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جدول تبدیل واحدهای استاندارد

 

Time

Unit

Symbol

Definition

Comments

second

sec

1 s

 

minute

min

60 s

 

hour

hr

60 min

 

hour

hour

1 hr

alternate symbol

hour

h

1 hr

alternate symbol

day

day

24 hr

 

shake

shake

10 ns

 

Hertz

Hz

1 s^-1

 

 

Length or Distance

Unit

Symbol

Definition

Comments

international foot

ft

0.3048 m

 

Inch

in

1.0/12.0 ft

 

international mile

mile

5280.0 ft

 

international mile

mi

1 mile

alternate symbol

milli-inch

mil

0.001 in

 

Parsec

pc

3.085678e16 m

 

League

league

3 mile

 

Astronomical Unit

ua

1.49598e11 m

 

Astronomical Unit

AU

1.49598e11 m

alternate symbol

Yard

yd

3 ft

 

Angstrom

Ang

1e-10 m

 

Angstrom

\\AA

1 Ang

alternate symbol

furlong

furlong

220 yd

 

fathom

fathom

6 ft

 

Rod

rd

16.5 ft

 

U.S. survey foot

sft

(1200./3937.) m

 

U.S. survey mile

smi

5280 sft

also called statue mile

Point

pt

1./72. In

Typeface Point

Pica

pica

1./6. In

Typeface Pica

 

Temperature

Unit

Symbol

Definition

Comments

Celsius

C

1 K -273.15

 

Rankine

R

5.0/9.0 K

 

Fahrenheit

F

1 R -459.67

 

Kelvin

K

1 K

 

 

Mass

Unit

Symbol

Definition

Comments

Gram

g

0.001 kg

This is case sensitive.

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

 

Slug

slug

1 lb sec^2/ft

 

Snail

snail

1 lb sec^2/in

 

Short Ton

ton

2000 lbm

 

Long Ton

ton_l

2240 lbm

 

Ounce

oz

28.34952 g

(avoirdupois)

Grain

gr

64.79891 mg

 

Pennyweight

dwt

1.55174 g

 

 

Force or Weight

Unit

Symbol

Definition

Comments

Newton

N

1 kg m/s^2

 

Dyne

dyn

1e-5 N

 

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

Unit

Symbol

Definition

Comments

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

Cal

4.1868 kJ

(nutritionists)

electron volt

eV

1.602177e-19 J

 

erg

erg

1e-7 J

 

Ton of TNT

TNT

4.184e9 J

 

 

Power

Unit

Symbol

Definition

Comments

Watt

W

1 J/s

 

Horse Power

hp

550 ft lb/s

 

 

Pressure

Unit

Symbol

Definition

Comments

bar

bar

1e5 N/m^2

 

Pascal

Pa

1 N/m^2

 

Pounds per sq. inch

psi

1 lb/in^2

 

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 / Area

Unit

Symbol

Definition

Comments

Liter

L

1/1000.0 m^3

 

gallon

gal

3.785412 L

 

Pint (U.S. liquid)

pint

1/8. Gal

 

Quart (U.S. liquid)

qt

2 pint

 

Pint (U.S. dry)

dpint

0.5506105 L

 

Quart (U.S. dry)

dqt

2 dpint

 

Acre

acre

1/640.0 smi^2

 

Hectare

ha

10000 m^2

 

Barrel (petroleum)

barrel

158.9873 L

 

Fluid Ounce

oz_fl

29.57353 mL

 

Gill (U.S.)

gi

0.1182941 L

 

Peck (U.S.)

pk

8.809768 L

 

Tablespoon

tbl

1/32. pint

 

Teaspoon

tsp

1/3. Tbl

 

Cup

cup

16. tbl

 

 

Electromagnetism

Unit

Symbol

Definition

Comments

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

 

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

Unit

Symbol

Definition

Comments

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

Unit

Symbol

Definition

Comments

pound mole

lbmole

1 mol lbm/g

quantity

poise

poise

1 g /sec cm

viscosity

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