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Gauge pressure is the pressure relative to atmospheric pressure. Absolute pressure is the sum of gauge pressure and atmospheric pressure. Aneroid gauge measures pressure using a bellows-and-spring arrangement connected to the pointer of a calibrated scale.
The average pressure at mean sea level in the International Standard Atmosphere is 1,013.25 hPa, or 1 atmosphere (atm), or 29.92 inches of mercury. Pressure (P), mass (m), and acceleration due to gravity (g) are related by P = F/A = (m*g)/A, where A is the surface area.
4 Νοε 2012 · The Standard Atmospheric Pressure is defined at sea-level at 273 o K (0 oC) and is 1.01325 bar or 101325 Pa (absolute) . The temperature of 293 o K (20 oC) is sometimes used. In imperial units the Standard Atmospheric Pressure is 14.696 psi.
The pressure exerted at sea level is 14.7 pounds per square inch (psi), or 1 bar. Pressure measured at sea level occurs due to the earth’s atmosphere, and for this reason is known as atmospheric pressure. Atmospheric pressure decreases as altitude above sea level increases.
Standard Atmospheric Pressure, the pressure at sea level under standard temperature conditions, is used as a benchmark for comparing measured values in scientific study and engineering. It's represented as '1 atm' and equals 101325 pascals (Pa).
Details. The atmospheric pressure is the pressure that an area experiences due to the force exerted by the atmosphere. For engineering calculations typically the pressure used is the pressure at sea level. Typically, the quantity used for engineering calculations is 1 atm, or 101 kPa.
Gauge pressure is zero-referenced against ambient air (or atmospheric) pressure, so gauge pressure readings include the pressure from the weight of the atmosphere. What this means is that gauge pressure varies according to height above sea level as well as to weather conditions.
