A mercury manometer located in a room at 25°C has a height of 750mm. What is the atmospheric pressure in kPa? Properties of Some Liquids at 25 C Given: h = 750mm = 0.75m Required: Patm=? Substance Ammonia Benzene Butane CCl₂ CO₂ Ethanol Gasoline Glycerine Kerosene Methanol a-Octane Oil engine Oil light Propane R-12 R-22 R-32 R-125 R-134a R-410 Water Liquid metals Bismuth, Bi Lead, Pb Mercury. Hg Nak (56/44) Potassium, K Sodium, Na Tin, Sn Zinc, Zn "Or Thigher (kg/m²) 604 879 556 1584 680 783 750 1260 815 787 692 885 910 510 1310 1190 961 1191 1206 1059 997 10040 10660 13580 887 828 929 6950 6570 G₂ (kJ/kg-K) 4.84 1.72 2.47 0.83 2.9 2.46 2.08 2.42 2.0 2.55 2.23 1.9 1.8 2.54 0.97 1.26 1.94 1.41 1.43 1.69 4.18 0.14 0.16 0.14 1.13 0.81 1.38 0.24 0.50
Kinetic Theory of Gas
The Kinetic Theory of gases is a classical model of gases, according to which gases are composed of molecules/particles that are in random motion. While undergoing this random motion, kinetic energy in molecules can assume random velocity across all directions. It also says that the constituent particles/molecules undergo elastic collision, which means that the total kinetic energy remains constant before and after the collision. The average kinetic energy of the particles also determines the pressure of the gas.
P-V Diagram
A P-V diagram is a very important tool of the branch of physics known as thermodynamics, which is used to analyze the working and hence the efficiency of thermodynamic engines. As the name suggests, it is used to measure the changes in pressure (P) and volume (V) corresponding to the thermodynamic system under study. The P-V diagram is used as an indicator diagram to control the given thermodynamic system.
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