# Chapter 16 - Section 16.4 - Exercises and Problems - Page 299: 19

$-40^{\circ}$

#### Work Step by Step

We know that: $T_f=1.8T_c+32$ We find when this is equal to $T_c$ $T_c=1.8T_c+32$ $T_c=-40^{\circ}$

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