Pa to psi units8/13/2023 ![]() In the US weather code remarks, three digits are all that are transmitted decimal points and the one or two most significant digits are omitted: 1,013.2 hPa (14.695 psi) is transmitted as 132 1,000 hPa (100 kPa) is transmitted as 000 998.7 hPa is transmitted as 987 etc. However, in Canada's public weather reports, sea level pressure is instead reported in kilopascals. The United States and Canada also report sea-level pressure SLP, which is adjusted to sea level by a different method, in the remarks section, not in the internationally transmitted part of the code, in hectopascals or millibars. In aviation weather reports ( METAR), QNH is transmitted around the world in hectopascals or millibars (1 hectopascal = 1 millibar), except in the United States, Canada, and Japan where it is reported in inches of mercury (to two decimal places). The altimeter setting in aviation is an atmospheric pressure adjustment.Īverage sea-level pressure is 1,013.25 hPa (29.921 inHg 760.00 mmHg). When barometers in the home are set to match the local weather reports, they display pressure adjusted to sea level, not the actual local atmospheric pressure. This is the atmospheric pressure normally given in weather reports on radio, television, and newspapers or on the Internet. The mean sea-level pressure (MSLP) is the atmospheric pressure at mean sea level (PMSL). Kollsman-type barometric aircraft altimeter. 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 barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. Please visit pressure conversion to convert all pressure units."Air pressure" redirects here. Psi (pounds per square inch) is 1 pound of force per square inch. ![]() Pascal is a metric pressure unit and is equal to a force of newton per square meter. To convert psi to pascal, multiply the psi value by 6894.75729.įor example, to convert 10 psi to pascals, multiply 6894.75729 by 10, that makes 68947.5729 Pa is equal to 10 psi. Psi = pascal / 6894.75729 How to convert psi to pascal (Pa)?ġ Psi is equal to 6894.75729 pascals (Pa). To convert pascal to psi, multiply the pascal value by 0.00014503773 or divide by 6894.75729.įor example, to convert 2000 pascals to psi, divide 2000 by 6894.75729, that makes 0.29 psi is equal to 2000 Pa. How to convert pascal (Pa) to psi?ġ Pascal (Pa) is equal to 0.00014503773 pound per square inch (psi). To convert pascal (Pa) to pound per square inch (psi), you may use the pascal to psi converter above.īelow, you will find information on how to convert pascal to psi and how to convert psi to pascal, including the formulas. ![]()
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