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Pressure%2c pefect gas law and enthalpy_0822

Pressure%2c pefect gas law and enthalpy_0822 - g =P abs-P...

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Pressure, perfect gas law and enthalpy Pressure: force exerted by fluid per unit area of the surface. SI unit: Pascal (Pa=N/m 2 ) 1 bar = 10 5 Pa =0.1 MPa = 100 kPa Standard atmospheric pressure: a pressure produced by a column of mercury 760 mm high. 1 atm = 101.3 kPa = 14.7 psi = 760 mm Hg = 1.013 bars Absolute pressure (P abs ): pressure is relative to absolute vacuum (P abs = 0). Gauge pressure (P g ) and vacuum pressure (P v ): relative to one atmospheric pressure. Gauge pressure, P
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Unformatted text preview: g =P abs-P atm Atmospheric pressure: P atm Vacuum pressure, P v =P atm-P abs Perfect vacuum: P abs =0 Perfect gas law: • PV=nR T A V: volume of gas (m 3 ) P: absolute pressure (Pa) n: amount of substance of gas (in moles) R : universal gas constant (8.314 J.K-1 .mol-1 ) T A : absolute temperature (K) Enthalpy: • H=E i +PV H: enthalpy (J), E i : internal energy (J), P: pressure (Pa), V: volume (m 3 ) • Relative value...
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