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This list of mechanical constants represent the most common values used in engineering,
physics, and chemistry.
Visit NIST for all
constants, units, and uncertainties. This is their
Extensive Listing
of constants.
| Horsepower |
HP |
745.7 W |
| Atmosphere |
Atm |
14.70 lb/in2 |
| Pi |
P |
3.141 592 653 589 793 238 46 |
| Natural log base |
e |
2.718 281 828 459 045 235 36 |
| Square root of 2 |
√2 |
1.414 213 562 372 095 048 80 |
| Euler's constant |
g |
0.577 215 664 901 532 860 61 |
| Golden Ratio |
f |
1.618 033 988 749 894 848 20 |
| 1º of latitude at 40º latitude |
|
69 mi |
| Acceleration of gravity |
g |
32.1726 ft/s2 |
| Knot |
kt |
1.1508 mi/hr |
| Speed of sound @ 0ºC |
|
1087.1 ft/s |
| Water heat of fusion @ 0ºC |
∆Hfus |
79.71 cal/g |
| Water heat of vaporization @ 0ºC |
∆Hvap |
539.55 cal/g |
| Acre |
|
43 560 ft2 |
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