How do things heat up and cool down?
In the word of science, the phenomenon in which the temperature of a substance increases or decreases is known as heat transfer. In the Imperial unit, the heat transfer from a system is usually indicated by BTU. The different types of heat transfer are shown below,
- Heat transfer due to conduction
- Heat transfer due to convection
- Heat transfer due to radiation
Answer and Explanation:
If the temperature of a body changes, then the body heats up or cools down. When then the temperature of a body is high, then the body is in the hotter condition, and if the temperature of a body is less, then the body is in the colder condition.
If a body is hotter and the temperature of the body is decreasing, then after some time, the body becomes colder. And if the body is in the colder condition and the temperature of the body is increasing, then after some time the body becomes hotter. So, when the heat from a hotter object moves in the direction of colder object or surrounding, then the hotter object cools down, and colder object warms up.
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Learn more about this topic:
from High School Physics: Help and ReviewChapter 17 / Lesson 12