When we pass from a very cold room to one moderately warm, how do we feel?
We have a feeling of warmth, although the room is no warmer than in the first instance.
How else can we prove that we judge of heat and cold by our feelings?
If one hand be held in quite warm water, and the other in quite cold water, for a few moments, and then both hands be plunged into tepid water, the tepid water will feel cold to the hand that was in the warm water, and warm to the hand that was in the cold water.
Is there anything without heat?
No; the coldest substance known still contains some heat.
How many kinds of heat are there?
There are two kinds of heat.
What are the two kinds of heat?
Heat accompanied by light, as the heat from the sun, or a lamp; and heat without light, as the heat from boiling water.