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Unformatted text preview: 30. From Eq. 27-20, ρ ∝ τ −1 ∝ veﬀ . The connection with veﬀ is indicated in part (b) of Sample Problem 275, which contains useful insight regarding the problem we are working now. According to Chapter 20,
veﬀ ∝ T . Thus, we may conclude that ρ ∝ T . ...
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