Vacuum pressure is measured in the negative direction, i.e. Gauge pressure The pressure is referenced to atmospheric pressure and by convention is measured in the positive direction, i.e.
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Absolute pressure can only have a positive value. Point A is considered as static pressure although the fluid above it is flowing.Ībsolute pressure The pressure is referenced to zero absolute pressure and has units of psia. Impact pressure (total pressure) is the sum of the static and dynamic pressures on a surface or object. In Fig., the dynamic pressure is (B − A). Dynamic pressure is the pressure exerted by a fluid or gas when it impacts on a surface or an object due to its motion or flow. Static pressure is the pressure of fluids or gases that are stationary or not in motion. 1 Newton is kg weight.ġ N/m2 is a very small pressure Therefore kilopascal (kPa) 1 atmosphere (14.7 psi, 750mmHg) is approximately 100 kPa = 1 bar 1 kPa is about 7 mmHg 1% of a gas at our altitude is about 7 mmHgĬollision of molecule with wall Momentum is mass x velocity Change of momentum is double Collision is isothermal = perfectly elastic Sum collisions over area to get force The acceleration of gravity is 9.8 m/sec2 The force due to gravity on a 1 kg mass is 9.8 N is 1 kg weight. Newton Kg Sec N/M2 = Pascal CGS CM Dyne Gram D/CM2 English Inch Pound Slug PSIĪ Newton is the force necessary to accelerate a mass of 1 kg at a rate of 1 meter per second per second. The pressure P of a force F distributed over an area A is defined as: P = F/Aģ Units of Measure System Length Force Mass Time Pressure MKS Meter
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2 Pressure definition Pressure is the action of one force against another over, a surface.