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Get Full Access to University Physics - 13 Edition - Chapter 19 - Problem 30e
Get Full Access to University Physics - 13 Edition - Chapter 19 - Problem 30e

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# In an adiabatic process for an ideal gas, the pressure ISBN: 9780321675460 31

## Solution for problem 30E Chapter 19

University Physics | 13th Edition

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Problem 30E

In an adiabatic process for an ideal gas, the pressure decreases. In this process does the internal energy of the gas increase or decrease? Explain your reasoning.

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Solution 30E First law of thermodynamics for a system is dq-dw=du In reversible adiabatic process dq=0 Therefore equation for this process is -dw=du When gas expands it do work i.e. dw= +ve therefore du = - ( +ve) du = -ve i.e change in internal energy = -ve internal energy decreasing or temperature is decreasing as internal energy is proportional to temperature only or roughly it is dependent to temperature Hence temperature is decreasing

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