Name of Dimension |
Dimension |
Units |
Length |
L |
meter, foot, mile, light year |
Time |
T |
second, hour, day, year |
Mass |
M |
gram, kilogram |
Real number (aka “dimensionless”) |
1 = M^0L^0T^0 |
hundred, thousand, percent, radian |
Area |
L^2 |
square foot, square meter, hectare, acre |
Volume |
L^3 |
cubic meter, cc, cubic foot, liter, gallon |
Velocity |
L/T |
meter/sec, mile/hour |
Acceleration |
L/T^2 |
meter/second^2, foot/second^2 |
Force, Mass x Acceleration |
ML/T^2 |
Newton, pound |
Energy, Work, Force x Distance, Power x Time |
ML^2/T^2 |
Joule, BTU, calorie, kilowatt-hour, foot-pound |
Power, Energy/Time |
ML^2/T^3 |
Watt, horsepower |
Mass Density |
M/L^3 |
kilogram/meter^3 |
Pressure, Force/Area |
M/(LT^2) |
newton/meter^2, pascal, psi (pounds per square inch), mm Hg, atmosphere |
Mass flux (Mass flow) |
M/T |
kilogram/second |
Mass flux density |
M/(TL^2) |
(kilogram/second)/meter^2 |