The density of air, ρ (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. At sea level and at 15°C according to ISA (International Standard Atmosphere), air has a density of approximately 1.225 kg/m3 (0.0023769 slugs/ft3).
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Famous quotes containing the word air:
“The air was clear. He seemed in ultimate peace
Except that he had no eyes. Rigid and bright
Upon the forehead, furred
With a light frost, crouched an outrageous bird.”
—Anthony Hecht (b. 1923)