Please choose the correct answer to the question: A student put 200 milliliters (mL) of water into a pot, sets the pot on a burner, and heats the water to boil. When the pot is taken off the burner, it contains only 180 milliliters (mL) of water. What happened to the rest of the water?

Answer1: It was used up. Answer2: It condensed. Answer3: It was absorbed by the heat. Answer4: It turned into water vapor.

Answer format: answer1/answer2/answer3/answer4
Answer: answer4