Logarithms of readings of pressure and volume for an ideal gas were plotted on the graph shown in Figure 3.86 (the line falls from $(1.10, 2.38)$ to $(1.30, 2.10)$ ). By measuring the gradient, it can be shown that the gas may be:

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The gradient is − 0.20 0.28 ​ = − 1.4 , so P V 1.4 = constant . That is an adiabatic change with γ = 1.4 , a diatomic gas. C.

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