| BTU |
British Thermal unit — 1 BTU= Heat required to raise temperature of 1 pound of water 1° F. |
| ° C |
Degrees Centigrade |
| CAL |
Calorie — 1 CAL. = Heat required to raise temperature of one gram of water 1° C |
| C. C. |
Cubic Centimeter |
| CU. FT. |
Cubic Feet |
| CU. IN. |
Cubic Inches |
| ° F |
Degrees Fahrenheit |
| FPS |
Feet per second |
| FT |
Feet (foot) |
| GAL |
U.S. Gallon |
| GPM |
Gallons per minute |
| HP |
Horsepower = work at rate of 33,000 FT. LB/MIN. |
| IN |
Inch(es) |
| ° K |
Degrees Kelvin |
| LB |
U.S. Pound |
| MIN |
Minute(s) of time |
| PSI |
Pounds per square inch |
| REV |
Revolutions (of a shaft or pump) |
| SEC |
Second(s) of time |
| SP. GR. |
Specific Gravity — Ratio of the weight of a body to the weight of an equal volume of water at 4° C or other specified temperature. |
| SP. HT. |
Specific Heat — Ratio of heat required to raise a unit of weight of a substance 1° F to the amount of heat required to raise an equal weight of water 1° F at a certain temperature (hydraulic oil is approx. 0.45). |
| SP. WT. |
Specific Weight or weight density = LB./CU. FT.; LB./CU. IN. or grams/C.C. |
| SQ. IN. |
Square inch(es) |