Length |
1 in = 25.4 mm
= 2.54 cm
1 m = 39.37
in
1 cm = 0.3937 in |
Area |
1 ft2
= 0.0929 m2
1 in2 = 645 mm2 |
Mass |
1 lb = 0.45359 kilogram
(kg) |
Volume |
1 in3
= 0.0163871 Liter (L) = 16.4
mL
1 ft3 = 7.48055 gal
= 28.317 L = 0.028317 m3
1 gal = 3.7854 L
= 0.0037854 m3* |
Energy |
1 ft-lb = 1.3558
joules (J)
1 calorie = 4.184 J
1 Btu =
1.05435 kJ
Btu/hr = cfm
x T in F x 1.10 (air)
Btu/hr = gpm x
T in F x 500.4 (water) |
Density |
1 lb/ft3
= 16.018463 kg/m3
1 lb/gal = 119.827 kg/m3 |
Temperature |
F = 1.8C + 32
C = (F - 32) / 1.8 |
Pressure |
1 psi =
6.8948 kilo-Pascals (kPa)
1 bar 100 kPa = 14.504 psi
1 in of Hg (60F) = 3.38 kPa
1 in of H2O (60F) = 249 Pa
1 ft of H2O = 2.99 kPa* |
Flow |
1 cfm = 0.472 L/s =
0.000472 m3/s
1 gpm = 0.0631 L/s = 0.0000631
m3/s |
Velocity |
1 fpm =
0.00508 m/s |
Wire gauge |
Square inch x
273,000 = Circular mils
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