Density is defined in a qualitative manner as the measure of the relative "heaviness" of objects with a constant volume. Ratio of an air sample's mass to its volume.
The ratio of the mass of a given amount of air to the volume which this amount occupies (i.e. lb/ft3 or kg/m3)
The ratio of the mass of a substance to the volume it occupies. In oceanography, it is equivalent to specific gravity and represents the ratio of the weight of a given volume of sea water to that of an equal volume of distilled water at 4.0 degrees Celsius or 39.2 degrees Fahrenheit.
The mass density of a parcel of air expressed in units of mass per volume.
The mass density of air expressed as weight per unit volume.
(also WEIGHT DENSITY). The weight of air in lbs per cubic foot. Dry standard air at T = 70 degrees f, bp = 29.92 inch Hg has a density of 0.075 lbs/cu ft.
A measurement of the mass of air per unit volume for a given air temperature.
total mass of air per given volume, the weight of a given volume of air. Air is denser at lower altitude, at lower temperature, and lower humidity.