Heat is best described as
Correct answer: C. energy in transit from a hotter body to a cooler one because of the temperature difference
- A. the total energy contained in a body
- B. the temperature of a body
- C. energy in transit from a hotter body to a cooler one because of the temperature difference
- D. a fluid that flows between bodies
Explanation
Heat is a process word: it names energy while it is being transferred, which is why a body is said to contain internal energy rather than to contain heat. Temperature measures the average kinetic energy of the particles and decides which way the transfer goes. The old caloric fluid picture was abandoned once friction was shown to generate heat without limit.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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