Learning Goal To Understand The Difference Between Absolute And Gage Pressure Pressure Can Be Specified In Two Differen 1 (56.38 KiB) Viewed 35 times
Learning Goal To Understand The Difference Between Absolute And Gage Pressure Pressure Can Be Specified In Two Differen 2 (33.08 KiB) Viewed 35 times
Learning Goal To Understand The Difference Between Absolute And Gage Pressure Pressure Can Be Specified In Two Differen 3 (27.41 KiB) Viewed 35 times
Learning Goal: To understand the difference between absolute and gage pressure Pressure can be specified in two different ways. An absolute pressure, Pabs, is the actual force per unit area exerted by a fluid. This is the pressure that must be used in thermodynamic calculations like the ideal gas law. A gage pressure, pg, is measured relative to some standard pressure. Unless otherwise noted, this is standard atmospheric pressure. This value is 101.3 kPa. Many engineering systems are exposed to the atmosphere, which makes using gage pressure convenient. Consider a surface with the atmosphere on one side and a pressurized fluid on the other side. The force on the surface depends on the pressure difference between the two sides. If the pressure is given in gage Figure Patm FI P D < 1 of 2 >
Part B-Force on a piston The piston shown (Eigure 1) is acting on a fluid whose pressure is P-135 kPa (abs) What force, F. must be applied to the piston to keep it stationary? The diameter D= 8 cm and the system is surrounded by air at standard pressure (101.3 kPa) and temperature (15°C) Express your answer in N to three significant figures. ▸ View Available Hint(s) F= Cubmel 195| ΑΣΦ | 11 Ivec CE N D
Y Part C-Force on a double-acting piston The piston (Eigure 2) has fluid on both sides. The gage pressure below the piston P₁= 15 kPa and the absolute pressure above the piston P₂80 kPa. What force F must be applied to the piston to keep it stationary? The diameter D= cm Neglect the magnitude of the force due to Patm acting on the rod relative to the magnitude of the force due to P₂ acting on the piston. Express your answer in N to three significant figures. ▸ View Available Hint(s) F= 15] ΑΣΦ | 41 Ivec → DONACI
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