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Torr (torr - Mercury), pressure. At sea level the atmospheric pressure is approximately 1 kilogram per square centimeter (14.7 pounds per square inch), which will cause a column of mercury in a … Atmospheric or air pressure is the pressure of air in a given environment. There are 0.00131579 atmospheres in a mmHg. The standard constant value used for atmospheric pressure at sea level is 1 atm (standard atmosphere) which equals 101325 pascals in SI units, and is equivalent to 29.9213 inches of mercury. In addition (the CGPM noted) there had been some misapprehension that it "led some physicists to believe that this definition of the standard atmosphere was valid only for accurate work in thermometry. It is sometimes used as a reference or standard pressure. The barometric pressure doesn’t have to change drastically to cause headaches, either. This video explains the basic concepts of Atmospheric Pressure! An atmosphere (atm) is a unit of pressure based on the average atmospheric pressure at sea level. The unit is named after Evangelista Torricelli, Italian physicist and mathematician, for his discovery of the principle of the barometer in 1643. What does it mean? [1] It was used as a reference condition for physical and chemical properties, and was implicit in the definition of the centigrade (later Celsius) scale of temperature by defining 100 °C as being the boiling point of water at this pressure. How many inch of mercury in 1 atm? The standard atmosphere value has many uses in atmospheric calculations and one example of this is the FAA procedures for setting aircraft altimeters at altitudes of 18,000 feet and above to ensure all aircraft are using the same pressure reference when measuring the height above sea level. Atmospheric pressure, also called barometric pressure, force per unit area exerted by an atmospheric column (that is, the entire body of air above the specified area). 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 (or standard atmosphere) is a non-SI unit of Pressure. The standard atmosphere (symbol: atm) is a unit of pressure defined as 101325 Pa (1.01325 bar). To calculate the number of atmospheres for a pressure value in other units please click on the relevant unit link below. A bar is a pressure unit defined as 100 kilopascals. © 2020 SensorsONE Ltd, all rights reserved, 5-18 psi absolute RS485 output air pressure sensor for flow monitoring density correction use, 1013 to 1400 mbar barometric pressure transmitter & readout, 5 to 20 psi absolute ambient 4 to 20 ma pressure transmitter, Barometric transducer with 23-34 inHg input range and 0-5Vdc output range, Average atmospheric pressure at sea level, 500 to 1100 hPa absolute USB interface pressure sensor, 30 psi barometric pressure transducer with 0-10Vdc out, Air flow normalising calculation barometric pressure transmitter, 550-1100mbar absolute 4-20mA high resolution air pressure sensor for environmental test chamber use, Barometric range 800-1100mb IECEx approved intrinsically safe pressure transmitter, cmH2O – Centimetres of Water Column at 4 deg C Pressure Unit, cmHg – Centimetres of Mercury at 0 deg C Pressure Unit, dyn/cm² – Dyne per Square Centimetre Pressure Unit, ftH2O – Feet of Water Column at 4 deg C Pressure Unit, g/cm² – Grams per Square Centimetre Pressure Unit, inH2O – Inches of Water Column at 4 deg C Pressure Unit, inHg – Inches of Mercury at 0 degrees C Pressure Unit, kg/cm² – Kilogram per Square Centimetre Pressure Unit, kg/mm² – Kilogram per Square Millimetre Pressure Unit, ksi – Kilopounds per Square Inch Pressure Unit, mH2O – Metres of Water Gauge at 4 deg C Pressure Unit, mmH2O – Millimetres of Water Column at 4 deg C Pressure Unit, mmHg – Millimetres of Mercury at 0 deg C Pressure Unit, N/cm² – Newton per Square Centimetre Pressure Unit, N/m2 – Newton per Square Metre Pressure Unit, N/mm² – Newton per Square Millimetre Pressure Unit, oz/in² – Ounce per Square Inch Pressure Unit, psf – Pounds per Square Foot Pressure Unit, psi – Pounds per Square Inch Pressure Unit, tsf – Tons per Square Foot (USA, Short) Pressure Unit, tsi – Tons per Square Inch (UK, Long) Pressure Unit, tsi – Tons per Square Inch (USA, Short) Pressure Unit, µHg – Micron of Mercury at 0 deg C Pressure Unit, What is the difference between gauge and absolute pressure measurement, Using Hydrostatic Pressure Transducers for Measuring Fluid Level, Using absolute pressure sensors to measure hydrostatic level, Measuring vacuum with negative gauge or absolute ranges, Measuring the difference in air pressure between rooms, Measuring liquid level in a sealed tank with a hydrostatic pressure sensor, How do you measure flow rate with a dp cell, Determining water tank volume using hydrostatic pressure, ATEX Classifications Glossary for products used in Explosive Atmospheres, Vertical Cylindrical Shaped Tank Contents Calculator, Total Volume & Total Time to Flow Rate Calculator, Temperature Transmitter 4-20mA Current Output Calculator, Pressure Transmitter 4-20mA Current Output Calculator, Piston Cylinder Pressure & Diameter to Force Calculator, Measurement Reading to 4-20mA Signal Converter, Liquid Level Transmitter 4-20mA Current Output Calculator, Liquid Depth/Level to Hydrostatic Pressure Calculator, Input to Output Measurement Reading Converter, Horizontal Cylindrical Shaped Tank Contents Calculator, 4-20mA Signal to Measurement Reading Converter. 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