Ideally, when a thermometer is used to measure the temperature of an object, the

Question

Ideally, when a thermometer is used to measure the temperature of an object, the temperature of the object itself should not change. However, if a significant amount of heat flows from the object to the thermometer, the temperature will change. A thermometer has a mass of 28.0 g, a specific heat capacity of c = 815 J/(kg · C°), and a temperature of 12.0° C. It is immersed in 119 g of water, and the final temperature of the water and thermometer is 44.8° C. What was the temperature of the water before the insertion of the thermometer?

Explanation / Answer

Heat gained by thermometer = Heat lost by water

=> (28 * 10-3) * 815 * (44.8 - 12) = 119 * 4.18 * (T - 44.8)

=> T = 46.3 oC

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