Atmospheric pressure at sea level is 14.7 pounds per square inch.
Psia
(pounds per square inch absolute) is also 14.7 pounds per square inch.
However psia starts with zero pounds per square inch at 29.92 in Hg which is a vacuum measurement (absolute vacuum) in inches of Mercury or in Hg.
14.7 psi atmospheric pressure is as high as atmosphere pressure will ever reach. all measurements below that is a vacuum. That is where psia come in. It can start measurements in a vacuum and continue with the same unit of measurement after it comes out of the vacuum at 14.7 psi.
Standard conditions, or standard temperature and pressure (STP) is the atmospheric pressure at sea level with temperature at zero degrees Celsius (273.15 Kelvin).
It is mean atmospheric pressure at sea level.
To calculate absolute pressure when a barometer reading is given, simply add the barometer reading to the atmospheric pressure at sea level, which is approximately 101.3 kPa or 14.7 psi. This will give you the absolute pressure at the specific location where the barometer reading was taken.
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Standard air pressure at sea level is 1 atmosphere, or 1 atm. This is the adopted standard atmosphere value, but sea level pressure will not always equal to this value due to changes in weather. 1 atm = 101 325 pascals = 1.01325 bars.
Psia at sea level under standard conditions is equal to 14.7 pounds per square inch absolute. This value represents the atmospheric pressure exerted at sea level under standard conditions of temperature and pressure.
14.7 pounds per square inch absolute (psia) at sea level under standard conditions.
A pressure measurement, in comparison to atmospheric pressure on Earth, at sea level, near sea level, at standard temperature, usually expressing an absolute pressure (but does not have to be). 1 atmosphere absolute = 1.01325 bar absolute 1 atmosphere absolute = 101,325 pascal absolute 1 atmosphere absolute = 14.69595 psi absolute
Standard conditions, or standard temperature and pressure (STP) is the atmospheric pressure at sea level with temperature at zero degrees Celsius (273.15 Kelvin).
Standard temperature and pressure (STP) is a temperature 0ºC (32ºF) with the air pressure the same as at sea level.
Standard conditions, or standard temperature and pressure (STP) is the atmospheric pressure at sea level with temperature at zero degrees Celsius (273.15 Kelvin).
Standard conditions, or standard temperature and pressure (STP) is the atmospheric pressure at sea level with temperature at zero degrees Celsius (273.15 Kelvin).
Pressure altitude and density altitude are the same value when the atmospheric conditions are standard (i.e., International Standard Atmosphere conditions). This typically occurs at sea level with a standard barometric pressure of 29.92 inHg and a standard temperature of 15 degrees Celsius.
Standard conditions, or standard temperature and pressure (STP) is the atmospheric pressure at sea level with temperature at zero degrees Celsius (273.15 Kelvin).
The term you're looking for is "standard atmospheric pressure," which is defined as the atmospheric pressure at sea level at zero degrees Celsius. It is commonly used as a reference point for pressure measurements in meteorology and other fields.
It is mean atmospheric pressure at sea level.
The pressure of gas has nothing to with ATP. However, the pressure of gas at STP, or Standard Temperature Pressure is 0 degrees Celsius and pressure is 1 ATM.