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.
However, air typically contains a lot of water vapor, which would make it more dense than the cited value. Answer: The density of dry air is 1.29 grams per liter (0.07967 pounds per cubic foot) at 32Â° Fahrenheit (0Â° Celsius) at average sea level barometric pressure (29.92 inchs of mercury or 760 millimeters). 1  At sea level and at 15Â°C, the density of air is 1.275 kg/m 3.