Considering air as an ideal gas, a process can be engineered by which a certain quantity of air change from thermodynamic state a to final state b, as shown in the pressure versus volume diagram. According to the information provided by the diagram and knowing that Va = 0.070 m3,

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter9: Heat Transfer With Phase Change

Section: Chapter Questions

Problem 9.1DP

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Concept explainers

Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.

Question

Considering air as an ideal gas,
a process can be engineered by which a certain quantity
of air change from thermodynamic state a to final state b, as shown in the pressure versus volume diagram. According to the information provided by the diagram and knowing that
Va = 0.070 m3,
Vb = 0.110 m3
P_a = 1.0 × 10^5 Pa and
P_b = 1,4 × 10^5 Pa. Answer:
(a) The air temperature according to the process will decrease, increase or
will it stay the same?
(b) How much work will be done by air during the process?

Science that deals with the amount of energy transferred from one equilibrium state to another equilibrium state.

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