Density

Density of city water at standard conditions =
62.4 lb_m/ft³ or 8.34 lb_m/gal

Density of water at 4°C (39.2°F) is 1 gm/cm³

Dissociation Constant of Water

K_w = 1 × 10^-14 (moles/L)²

Atmospheric Lapse Rates

Name of lapse rate	Rate in F/ft	Rate in C/km
Dry adiabatic lapse rate	5.5oF/1000 ft.	9.8oC/km
Moist adiabatic lapse rate	3.2oF/1000 ft.	5.8oC/km
Dewpoint adiabatic lapse rate	1.0oF/1000 ft. 3.2oF/1000 ft above the LCL	1.8oC/km
Temperature-dewpoint approach rate	4.5oF/1000 ft.	8.0oC/km
Normal temperature lapse rate	3.5oF/1000 ft.	6.5oC/km

Universal Gas Constant, R