A mule is a cross between a donkey and a horse. Therefore, a mule will have some donkey characteristics such as large ears, a head just a bit too large for its body, a skimpie â¦ r tail, some still have the cross on their backs from the donkey, and they often have small looking feet.
Density of air. The density of air, Ï (Greek: rho) (air density), is the mass per unit volume of Earth's atmosphere, and is a useful value in aeronautics and other sciences. Air density decreases with increasing altitude, as does air pressure. It also changes with variances in temperature or humidity.
Calculate the density of dry air, water vapor or the mixture of air and water vapor-moist or humid air. Ïa = 0.0035 pa / T (1) where Ïa = density dry air (kg/m3) pa = partial pressure of air (Pa, N/m2) T = absolute dry bulb temperature (K).hen water vapor content increases in the moist air the amount of Oxygen and Nitrogen decreases per unit volume and the density decreases because the mass is decreasing. 1  Dry air is more dense that humid air!