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QUANTITY AND UNIT
08/19/2016

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5/21/201511:43:32 AM

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Quantity Unit     
Mass Kilogram
Force Newton
Length Meter
Energy Joule
Resistance Ohm
Volume Liter
Angle Radians
Power Watt
Potential Volt
Work Joule
Time Second
Current Ampere
Luminosity Candela
Pressure Pascal
Area Hectare / square meter
Temperature  Degrees
Conductivity Mho
Magnetic Field Oersted



SI Units and Symbols used in the Guide





Subject Physical Quantity Symbol Name Unit
Mechanics Mass m, M kilogram kg
Linear position
Length, Distance
Radius
x, r
l, d
R
meter m
Time t, second s
Linear angle,
Angular position
, radian rad
Spherical angle steradian sr
Area A - m2
Volume V - m3
Moment of inertia I - kg*m2
Density - kg/m3
Linear velocity v, u, c - m/s
Angular velocity , - rad/s
Linear momentum p - kg*m/s
Angular momentum L - kg*m2/s
Linear acceleration a - m/s2
Angular acceleration - rad/s2
Force F newton N=kg*m/s2
Torque - N*m
Impulse I - N*s
Work
Energy
W
E
joule J=N*m
Power P watt W=J/s
Dynamic viscosity - Pa*s
Electricity and Magnetism

Current I ampere A
Charge Q, q, e coulomb C=A*s
Current density j - A/m2
Volume charge density - C/m3
Surface charge density - C/m2
Linear charge density - C/m
Electric potential
Voltage
emf

V
volt V=J/C
Electric field E - N/C, V/m
Electric flux - V*m
Electric moment pe - C*m
Resistance R, r ohm =V/A
Specific resistance - *m
Capacitance C farad F=C/V
Specific conductivity - (*m)-1
Magnetic field B tesla T=N/(A*m)
Magnetic flux weber Wb=T*m2=V*s
Inductance
Mutual-inductance
L
M
henri H=Wb/A
Magnetic moment pm - A*m2
Polarization P - C/m2
Magnetization I - A/m
Thermodynamics Temperature T kelvin K
Substance quantity M mole mol
Pressure P - Pa
Heat Q - J
Heat capacity
Entropy
C
S
- J/K
Specific heat c - J/(kg*K)
Molar heat cm - J/(mol*K)
energy flux j - W/m2
Surface tension - N/m
Stress
Elasticity modulus

E
pascal Pa=N/m2
Oscillations and Waves

Wavelength - m
Wave number k - m-1
Frequency f hertz Hz
Energy density - J/m3
Energy flux J - J/m2
Intensity I - J/(m2*s)
Reactance
Impedance
X
Z
ohm =V/A
Optics

Focal length f - m
Luminous intensity I candela cd
Luminous flux lumen lm=cd*m2
Illuminance E lux lk=lm/m2
Brightness L - cd/m2
Linear absorption coefficient - m-1
Quantum Physics Mass absorption coefficient - m2/kg
Radioactive activity A becquerel Bq=s-1
Absorbed dose D gray Gy=J/kg





COMMONLY USED ABBREVIATIONS
Abbreviations may stand for singular or plural usage
cm = centimeter cu. = cubic ft. = foot gl. = gallon (US)
gr. = gram Imp. = Imperial in. = inch kg. = kilogram
km. = kilometer l. = liter lb. = pound m. = meter
mi. = mile oz. = ounce qt. = quart std. = standard
US = United States yd. = yard




 

LENGTH MEASURES



Common Usage
Reciprocal Value



1 ft. = 12 in..
1 in. = 0.0833 ft.



1 yd. = 3 ft.
1 ft. = 0.3333 yd.



1 rod = 5.5000 yd.
1 yd. = 0.1818 rods



1 furlong = 40 rods
1 rod = 0.0250 furlongs



1 mile = 8 furlongs
1 furlong = 0.1250 mi.



1 mi. = 5,280 ft.
1 ft. = 0.000189 mi.



1 mi. = 1,760 yd.
1 yd. = 0.000568 mi.



1 fathom = 6 ft.
1 ft. = 0.1667 fathom



120 fathoms = 1 cable
1 cable = 0.00833 fathoms



1 league = 3 mi.
1 mi. = 0.3333 leagues



1 nautical mi. = 6076.11 ft.
1 ft. = 0.000165 natical mi.



1 hand = 4 in. (equestrian)
1 in. = 0.2500 hands








METRIC


1 in. = 2.54 cm.
1 cm. = 0.3937 in.



1 ft. = 30.48 cm.
1 cm. = 0.0328 ft.



1 m. = 3.2808 ft.
1 ft. = 0.3048 m.



1 m. = 39.37 in.
1 in. = 0.0254 m.



1 m. = 1.0936 yd.
1 yd. = 0.9144 m.



1 rod = 5.029 m.
1 m. = 0.1988 rod



1 km = 1000 m.
1 m. = 0.001 km.



1 km = 0.621 mi.
1 mi. = 1.6103 km.















SQUARE MEASURES



Common Usage
Reciprocal Value



1 sq. ft. = 144 sq. in.
1 sq. in = 0.0069 sq. in.



1 sq. yd. = 9 sq. ft.
1 sq. ft. = 0.1111 sq. yd.



1 sq. rod = 30.25 sq. yd.
1 sq. yd. = 0.0331 sq. rods



1 sq. mi. = 640 acres
1 acre = 0.0016 sq. mi.








METRIC


1 sq. cm. = 0.1550 sq. in.
1 sq. in. = 6.452 sq. cm.



1 sq. ft. = 0.0929 sq. m.
1 sq. m. = 10.7643 sq. ft.



1 sq. m. = 1.196 sq. yd.
1 sq. yd. = 0.8361 sq. m.



1 hectare = 2.47 acres
1 acre = 0.4049 hectares



1 sq. km. = 0.386 sq. mi.
1 sq. mi. = 2.59 sq. km.















CUBIC & VOLUME MEASURES



Common Usage
Reciprocal Value



1 cu. ft. = 1,728 cu. in
1 cu. in. = 0.0005787 cu. ft.



1 cu. yd. = 27 cu. ft.
1 cu. ft. = 0.0370 cu. yd.



1 cord (wood) = 128 cu. ft.
1 cu. ft. = 0.0078 cord



1 US std. gal. = 231 cu. in.
1 cu. in. = 0.00016 US std. gal.








METRIC


1 cu. in. = 16.39 cu. cm.
1 cu. cm. = 0.0610 cu. in.



1 cu. m. = 35.3357 cu. ft.
1 cu. ft. = 0.0283 cu. m.



1 cu. m. = 1.308 cu. yd.
1 cu. yd. = 0.7646 cu. m.








DRY MEASURES


1 qt. = 2 pints
1 pint = 0.5000 qt.



1 peck = 8 qt.
1 qt. = 0.1250 peck



1 bushel = 4 pecks
1 peck = 0.2500 bushels








METRIC


1 qt. dry = 1.101 l.
1 l. = 0.908 qt. dry



1 peck = 8.810 l.
1 l. = 0.1135 peck



1 hectoliter = 2.8375 bushels
1 bushel = 0.3524 hectoliters








LIQUID MEASURES


1 pint = 2 cup
1 cup = 0.5000 pints



1 qt. = 2 pints
1 pints = 0.5000 qt.



1 gl. = 4 qt.
1 qt. = 0.2500 gl.



1 gl. = 8 pints
1 pint = 0.125000 gl.



1 barrel = 31.5 gl.
1 gl. = 0.0317 barrel








IMPERIAL & METRIC LIQUID MEASURE


1 US gl. = 0.833 Imp. gl.
1 Imp. gl. = 1.201 US gl.



1 Imp. gl. = 4.546 l.
1 l. = 0.2200 Imp. gl.



1 l. = 0.264 US gl.
1 US gl. = 3.7879 l.



1 l. = 1.0567 qt. liquid
1 qt. liquid = 0.9463 l.



1 gl. = 3.7854 l.




1 l. = 0.2642 gl.