28
Mar
A standard atmosphere can be regarded as an average pressure temperature and air density for various altitudes. M v ρ 10 m 3 0 946 kg m 3 9 46 kg where m mass kg v volume m 3 ρ density kg m 3 example mass of air at temperature 20 o c.
The mass of 10 m 3 air can be calculated as.
Air density in english units. The density of air or atmospheric density denoted ρ is the mass per unit volume of earth s atmosphere. Air density like air pressure decreases with increasing altitude. It also changes with variation in atmospheric pressure temperature and humidity.
At 1013 25 hpa and 15 c air has a density of approximately 1 225 kg m about 1 1000th that of water according to isa. Air density is a property used in many branches of science engineering and industry including aeronautics. From the table above the density of air is 0 946 kg m 3 at 100 o c.
The mass of 10 m 3 air can be calculated as. M v ρ 10 m 3 0 946 kg m 3 9 46 kg where m mass kg v volume m 3 ρ density kg m 3 example mass of air at temperature 20 o c. From the table above the density of air is 1 205 kg m 3 at 20 o c.
The density of air ρ greek. Rho air density is the mass per unit volume of earth s atmosphere. Air density like air pressure decreases with increasing altitude.
It also changes with variation in temperature or humidity. At sea level and at 15 c air has a density of approximately 1 225 kg m 3 0 001225 g cm 3 0 0023769 slug ft 3 0 0765 lbm ft 3 according to isa international standard atmosphere. Air density in english units and kg m3 the standard measurement type for air density is kilograms per cubic meter kg m3.
Many people also use the following. G cm gram per cubic centimeter 1 g cm 0 001 kg m kg l kilogram per liter 1kg l 1 000 kg m g ml gram per milliliter 1g ml 1 000 kg m what you use for measuring can depend on your situation. Air weighs 0 0012929 gram per cubic centimeter or 1 2929 kilogram per cubic meter i e.
Density of air is equal to 1 2929 kg m in imperial or us customary measurement system the density is equal to 0 080713 pound per cubic foot lb ft or 0 000747344 ounce per cubic inch oz inch. See the humidity calculator to compute the density of air at various values of temperature relative. The isa or international standard atmosphere states the density of air is 1 225 kg m3 at sea level and 15 degrees c.
The iupac uses an air density of 1 2754 kg m3 at 0 degrees c and 100 kpa for dry air. Density is affected not only by temperature and pressure but also by the amount of water vapor in the air. Density of air in kg m and density of air in english units.
The si unit for density is kilogram per cubic meter kg m. However in some cases it is more convenient to use. Gram per cubic centimeter g c m 1 g cm 0 001 kg m.
Kilogram per liter kg l 1 kg l 1000 kg m. Gram per milliliter g ml 1 g ml 1000 kg m. The air density is the mass of air per its unit volume.
It is denoted by the greek letter ρ rho and measured in kg m in si or lb ft. Isa international standard atmosphere and 1976 u s. Standard atmosphere define air density at the standard pressure 1013 25 hpa and temperature 15 c as 1 225 kg m or 0 0765 lb ft.
A standard atmosphere can be regarded as an average pressure temperature and air density for various altitudes. Standard atmosphere 1976 is an atmospheric model of how the pressure temperature density and viscosity of the earth s atmosphere changes with altitude it is defined as having a temperature of 288 15 k 15 o c 59 o f at the sea level 0 km geo potential height and. B in the text in si and english units respectively a l s t h h g 0 p s 1 01325 105 n m 2 2116 2 lb ft ρ s 1 2250 kg m3 0 002377 slug ft3 t s 288 16 k 518 69 r from sea level we can calculate the rest the calculated values are available in appendices a b in the text in si and english units respectively.