HAVE YOU experienced touching a hot object–like the cover of your kettle? Your reflexes immediately responds to the heat that is being transferred from the hotter metal to your colder hand, thus, you pull your hand back, right away. That is an example of energy transfer via heat. It happens because there is a difference in the temperature between the metal (hotter) and your hand (colder).
When you place a glass of water in the refrigerator, it becomes colder after a while. What do you think happened? Which has higher temperature at first: the glass of water or the environment inside the refrigerator? How did the energy transfer?
It is colder at night than during the day. That is because we don’t receive sunlight at night. That mean energy from the sun is being transferred to the earth. How does this happen?
Read the presentation below and then answer the questions in the form that follows.
Let’s see what you have learned: