User:Cool cat anu/sandbox

Heat is a form of energy. It makes a substances hotter. Heat cannot be seen by us. We can feel the heat by the 'temperature effect' it produces. When heat is given to a substances, its temperature increases and it becomes hotter. For example, when a utensil is kept on a gas burner, it gets heat, its temperature increases and it becomes hot. On the other hand, when heat is removed from a substance, then its temperature decreases and it becomes cold. For example, when water is kept in a refrigerator, then heat gets removed from water, its temperature decreases and it becomes cold.