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# PRESSURE Units Conversion

## PRESSURE UNIT MEASUREMENT

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure is the pressure relative to the ambient pressure.

Various units are used to express pressure. Some of these derive from a unit of force divided by a unit of area; the SI unit of pressure, the pascal (Pa), for example, is one newton per square meter; similarly, the pound-force per square inch (psi) is the traditional unit of pressure in the imperial and US customary systems. Pressure may also be expressed in terms of standard atmospheric pressure; the atmosphere (atm) is equal to this pressure and the torr is defined as  1/760 of this. Manometric units such as the centimeter of water, millimeter of mercury, and inch of mercury are used to express pressures in terms of the height of column of a particular fluid in a manometer.

The SI unit for pressure is the pascal (Pa), equal to one newton per square meter (N/m2 or kg·m−1·s−2). This name for the unit was added in 1971; before that, pressure in SI was expressed simply in newtons per square meter.

Other units of pressure, such as pounds per square inch and bar, are also in common use. The CGS unit of pressure is the barye (Ba), equal to 1 dyn·cm−2 or 0.1 Pa. Pressure is sometimes expressed in grams-force or kilograms-force per square centimeter (g/cm2 or kg/cm2) and the like without properly identifying the force units. But using the names kilogram, gram, kilogram-force, or gram-force (or their symbols) as units of force is expressly forbidden in SI. The technical atmosphere (symbol: at) is 1 kgf/cm2 (98.0665 kPa or 14.223 psi).

## Units of pressure

• Atmosphere At Technical (at)
• Atmosphere Atm Standard (atm)
• Attopascals (aPa)
• Bars (bar)
• Barye (Ba)
• Centimeter Of Mercury (cmHg)
• Centimeter Of Water (cmH2o)
• Centipascals (cPa)
• Decapascals (daPa)
• Decipascals (dPa)
• Dyne Per Square Centimeter (dyn/cm2)
• Dyne Per Square Foot (dyn/ft2)
• Dyne Per Square Inch (dyn/in2)
• Dyne Per Square Meter (dyn/m2)
• Dyne Per Square Millimeter (dyn/mm2)
• Dyne Per Square Yard (dyn/yd2)
• Exapascals (EPa)
• Femtopascals (fPa)
• Foot Of Air 15°C (ft Air)
• Foot Of Mercury (ftHg)
• Foot Of Water (ftH2o)
• Foot Of Water 15.5°C Or 60°F (ftH2o 60F)
• Foot Of Water 4°C Or 39.2°F (ftH2o 39F)
• Gigapascals (GPa)
• Gram Force Per Square Centimeter (g/cm2)
• Hectopascals (hPa)
• Inch Of Air 0°C (in Air 0C)
• Inch Of Air 15°C (in Air 15C)
• Inch Of Mercury (inHg)
• Inch Of Mercury 0°C Or 32°F (inHg 32F)
• Inch Of Mercury 15.5°C Or 60°F (inHg 60F)
• Inch Of Water (inH2o)
• Inch Of Water 4°C Or 39.2°F (inH2o 39F)
• Kilogram Force Per Square Centimeter (kgf/cm2)
• Kilogram Force Per Square Foot (kgf/ft2)
• Kilogram Force Per Square Inch (kgf/in2)
• Kilogram Force Per Square Meter (kgf/m2)
• Kilogram Force Per Square Millimeter (kgf/mm2)
• Kilogram Force Per Square Yard (kgf/yd2)
• Kilonewton Per Square Centimeter (kN/cm2)
• Kilonewton Per Square Foot (kN/ft2)
• Kilonewton Per Square Inch (kN/in2)
• Kilonewton Per Square Meter (kN/m2)
• Kilonewton Per Square Millimeter (kN/mm2)
• Kilonewton Per Square Yard (kN/yd2)
• Kilopascals (kPa)
• Kip Force Per Square Foot (kip/ft2)
• Kip Force Per Square Inch (kip/in2)
• Ksi (ksi)
• Meganewton Per Square Centimeter (MN/cm2)
• Meganewton Per Square Feet (MN/ft2)
• Meganewton Per Square Inch (MN/in2)
• Meganewton Per Square Kilometer (MN/km2)
• Meganewton Per Square Meter (MN/m2)
• Meganewton Per Square Yard (MN/yd2)
• Megapascals (MPa)
• Meter Of Air 0°C (m Air 0C)
• Meter Of Air 15°C (m Air 15C)
• Microbars (µBar)
• Micrometer Of Mercury (µHg)
• Micropascals (µPa)
• Millibars (mBar)
• Millimeter Of Mercury (mmHg)
• Millimeter Of Water (mmH2o)
• Millipascals (mPa)
• Millitorrs (mTorr)
• Nanopascals (nPa)
• Newton Per Square Centimeter (N/cm2)
• Newton Per Square Foot (N/ft2)
• Newton Per Square Inch (N/in2)
• Newton Per Square Meter (N/m2)
• Newton Per Square Millimeter (N/mm2)
• Newton Per Square Yard (N/yd2)
• Ounce Per Square Foot (oz/ft2)
• Ounce Per Square Inch (oz/in2)
• Ounce Per Square Yard (oz/yd2)
• Pascals (Pa)
• Petapascals (PPa)
• Picopascals (pPa)
• Pieze (pz)
• Pound Force Per Square Centimeter (lbf/cm2)
• Pound Force Per Square Foot (lbf/ft2)
• Pound Force Per Square Inch (PSI lbf/in2)
• Pound Force Per Square Meter (lbf/m2)
• Pound Force Per Square Mile (lbf/mi2)
• Pound Force Per Square Millimeter (lbf/mm2)
• Pound Force Per Square Yard (lbf/yd2)
• Poundal Per Square Foot (pdl/ft2)
• Poundal Per Square Inch (pdl/in2)
• Poundal Per Square Meter (pdl/m2)
• Poundal Per Square Yard (pdl/yd2)
• Psi (pound per square inch)
• Psi (psi)
• Short Ton Per Square Foot (tonf/ft2)
• Terapascals (TPa)
• Ton Force Long Per Square Foot (long tonf/ft2)
• Ton Force Long Per Square Inch (long tonf/in2)
• Ton Force Short Per Square Foot (short tonf/ft2)
• Ton Force Short Per Square Inch (short tonf/in2)
• Torrs (Torr)