Pressure unit conversions are one of the most common types of conversions because barometers (the instruments used to measure pressure) use any of a number of units, depending on their country of manufacture, the method used to measure pressure, and intended use. High in the atmosphere, air pressure decreases. That means air exerts 14.7 pounds per square inch (psi) of pressure at Earth’s surface. Let's take a closer look at the conversion formula so that you can do these conversions yourself with a calculator or with an old-fashioned pencil and paper. Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of Earth.The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa; 1,013.25 mbar), which is equivalent to 760 mm Hg, 29.9212 inches Hg, or 14.696 psi. A manometer with one side open to the atmosphere is an ideal device for measuring gauge pressures. Altitude above Sea Level Absolute Atmospheric Pressure; feet: miles: meters: kPa: atm: psia-5000-0.95-1524: 121.0: 1.19: 17.55-4000-0.76-1219: 116.9: 1.15: 16.95-3000 Conversion Formula. Barometric pressure often is measured in inches of mercury, or in-Hg. In Figure 2(c), atmospheric pressure can support a column of fluid of height h, and so P abs is less than atmospheric pressure by an amount hρg (the gauge pressure P g is negative). Standard atmospheric pressure can also be expressed using different units, including 1013.25 millibars, 1013.25 hectoPascals, 760 millimeters of mercury and 29.92 inches of mercury. The symbol for atmosphere is atm. The normal air pressure at sea level is 14.7 pounds per square inch. About Pressure Conversions . One atmosphere is 1,013 millibar s, or 760 millimeters (29.92 inches) of mercury. With fewer air molecules above, there is less pressure from the weight of the air above. An atmosphere (or standard atmosphere) is a non-SI unit of Pressure. A change of 0.003 to 0.04 in-Hg in less than three hours indicates a slow change in barometric pressure. Standard atmospheric pressure Standard atmospheric pressure (atm) in pascals is 1013.25 hPa = 760 mm Hg = 29.9212 inches Hg = 14.696 psi Changing the barometric pressure can affect our mood, in … An atmosphere (atm) is a unit of measurement equal to the average air pressure at sea level at a temperature of 15 degrees Celsius (59 degrees Fahrenheit). Beside mbar and atm, units you may encounter include torr (1/760 atm), millimeters of … 1 standard atmosphere is defined as being exactly equal to 101,325 pascals. One standard atmosphere, which is also referred to as one atmosphere… normal atmospheric pressure in atm, Above every square inch on the surface of the Earth is 14.7 pounds of air. If barometric pressure rises or falls more than 0.18 in-Hg in less than three hours, barometric pressure is said to be changing rapidly. 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