dry palms wet palms palms covered with oil palms covered with lotion
I gave my students this multiple choice question: George wants to warm his hands quickly by rubbing them. Which skin surface will produce the most heat?

Only one answer is correct among these 4 choices:
- dry palms
- wet palms
- palms covered with oil
- palms covered with lotion

Could you tell me which one is correct?

dry palms