12/26/2023 0 Comments Psi to kpa chart![]() ![]() ![]() It is modified by the planetary rotation and local effects such as wind velocity, density variations due to temperature and variations in composition. A column of air with a cross-sectional area of 1 in 2 would have a weight of about 14.7 lbf, resulting in a pressure of 14.7 lbf/in 2.Ītmospheric pressure is caused by the gravitational attraction of the planet on the atmospheric gases above the surface and is a function of the mass of the planet, the radius of the surface, and the amount and composition of the gases and their vertical distribution in the atmosphere. On average, a column of air with a cross-sectional area of 1 square centimetre (cm 2), measured from the mean (average) sea level to the top of Earth's atmosphere, has a mass of about 1.03 kilogram and exerts a force or "weight" of about 10.1 newtons, resulting in a pressure of 10.1 N/cm 2 or 101 kN/m 2 (101 kilopascals, kPa). Pressure measures force per unit area, with SI units of pascals (1 pascal = 1 newton per square metre, 1 N/m 2). Because the atmosphere is thin relative to the Earth's radius-especially the dense atmospheric layer at low altitudes-the Earth's gravitational acceleration as a function of altitude can be approximated as constant and contributes little to this fall-off. ![]() As elevation increases, there is less overlying atmospheric mass, so atmospheric pressure decreases with increasing elevation. In most circumstances, atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. The atm unit is roughly equivalent to the mean sea-level atmospheric pressure on Earth that is, the Earth's atmospheric pressure at sea level is approximately 1 atm. The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa), which is equivalent to 1,013.25 millibars, 760 mm Hg, 29.9212 inches Hg, or 14.696 psi. For the pressure of air in other systems, see Pressure.Ītmospheric pressure, also known as air pressure or barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |