Question

Question 3. i. Define absolute pressure, gage pressure and vacuum pressure. ii. If a mercury barometer reads 720 mm Hg. Determine the atmospheric pressure in kPa and psi. (I psi -6.895 kPa. Density of Hg - 13.56 g/cc).

Answer 1

Question 3 ce) Absolute pressure The pressure at a given point es absolute pressure, it is measure te pressure, it is measured gelative called to absolute zero. Gauge pressure :- Gauge pressure is the pressure relative to the atmospheric pressure . It is measured with respect to the atmospheric pressure Vacuum pressure y pressure below the atmospheric pressure vacuum pressure Called - in --a Pange --- Gauge pressure absolute 1. pressure L Atmospheric pressure vacuum vacuum pressure p=o aton Barometer reading = P = PgH 720 mm Hg

po mercury dengity 13.56g|cc (o) 13.56 kg/m3 p = 13.56 kg x 720 mm x 9.81 m / 2 = 95.992 kpa 1 psi = 6.895 kpa si 5 13.92 psi po 95-992 G. 895 | 720 mm of Hg 13-92 psi mm => 95.992 kpa Question 4 can be Energy :- There exists for every system a property called energy. The system energy can considered as a sum of internal energy, kinetic energy potential energy and chemical energy potential Energy :- potential energy, Stored energy that depende upon the gelative position of variory

parts of a system with gravition PE = mg Kinetic Energy posses as a some reference The energy that a system result of its motion relative to frame is called Kinetic energy. I KE = 1 mv? KE = Intemal Energy The sum of all the microscopic forms of energy is called the internal energy and is denoted by u. microscopic forms of energy are those related to the molecular structure of a system (1) Mechanism of internal Energy I work 2 heat flow Internal energy change results from the combination of heat and work between the system and

it's surroundings change in internal energy AU = 9-w