Mechanical Constants

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.

Name	Symbol	Value
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	∆H_fus	79.71 cal/g
Water heat of vaporization @ 0ºC	∆H_vap	539.55 cal/g
Acre		43 560 ft²

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