In order for two objects to have the same temperature, they must
A) be in thermal equilibrium.
B) be in thermal contact with each other.
C) have the same relative "hotness" or "coldness" when touched.
D) have all of the properties listed above.
E) have only properties (b) and (c) above.

Question

Quizplus · Accepted Answer

Two objects must be in thermal equilibrium to have the same temperature. This means that they are in contact with each other and there is no net heat flow between them. They may not necessarily have the same relative "hotness" or "coldness" when touched, as this is a subjective perception that can vary between individuals. Therefore, options B and C are not sufficient on their own. Option D is true, but not the best choice as A is the most accurate and precise description of the necessary condition for two objects to have the same temperature. Option E is incorrect as it does not include the necessary condition of thermal equilibrium.

In Order for Two Objects to Have the Same Temperature