EXAMPLE 2.7 Nitrogen gas is confined in a cylinder and the pressure of the gas is maintained by a weight placed on the piston. The mass of the piston and the weight together is 100lb. The acceleration due to gravity is 9.81 m/s² and the atmospheric pressure is one standard atmosphere. Assuming the piston is frictionless, determine: (a) The force exerted by the atmosphere, the piston and the weight on the gas in N if the piston diameter is 4in. (b) The pressure of the gas in bar and psi. (c) If the gas is allowed to expand pushing up the piston and the weight by 400 mm, what is the work done by the gas in kJ ? (d) What is the change in the potential energy of the piston and the weight after the expansion in part (c)?
EXAMPLE 2.7 Nitrogen gas is confined in a cylinder and the pressure of the gas is maintained by a weight placed on the piston. The mass of the piston and the weight together is 100lb. The acceleration due to gravity is 9.81 m/s² and the atmospheric pressure is one standard atmosphere. Assuming the piston is frictionless, determine: (a) The force exerted by the atmosphere, the piston and the weight on the gas in N if the piston diameter is 4in. (b) The pressure of the gas in bar and psi. (c) If the gas is allowed to expand pushing up the piston and the weight by 400 mm, what is the work done by the gas in kJ ? (d) What is the change in the potential energy of the piston and the weight after the expansion in part (c)?
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:EXAMPLE 2.7 Nitrogen gas is confined in a cylinder and the pressure of the gas is
maintained by a weight placed on the piston. The mass of the piston and the weight
together is 100lb.
The acceleration due to gravity is 9.81 m/s² and the atmospheric pressure is one
standard atmosphere. Assuming the piston is frictionless, determine:
(a) The force exerted by the atmosphere, the piston and the weight on the gas in N if the
piston diameter is 4in.
(b) The pressure of the gas in bar and psi.
(c) If the gas is allowed to expand pushing up the piston and the weight by 400 mm, what
is the work done by the gas in kJ ?
(d) What is the change in the potential energy of the piston and the weight after the
expansion in part (c)?
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