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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“They may bring their fattest cattle and richest fruits to the fair, but they are all eclipsed by the show of men. These are stirring autumn days, when men sweep by in crowds, amid the rustle of leaves like migrating finches; this is the true harvest of the year, when the air is but the breath of men, and the rustling of leaves is as the trampling of the crowd.”
—Henry David Thoreau (1817–1862)