Which of the following is an example of heat transfer?
a. ice cubes are crushed into ice chips.
b. a spoon in a cup of hot soup becomes warmer.
c. macaroni swell in size when left in a pot of water.
d. two panes of glass are at the same temperature as air trapped between them.
Heat transfer means the floe of heat from a body at higher temperature to a body at lower temperature. Heat transfer can mainly occur by three processes- conduction, convection and radiation.
Answer and Explanation:
A spoon in a cup of hot soup becomes warmer is an example of heat transfer. This can be easily understood that the heat energy present in the warm soup gets transferred to the spoon which is in direct contact with the soup. This gain in energy cause the spoon to undergo an increase in temperature and hence, it becomes warmer.
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Learn more about this topic:
from High School Physics: Help and ReviewChapter 17 / Lesson 12