question: What sentence would provide a factual answer to this question: "If you breathe out, especially in the vicinity of clear glass, you may witness"

answer: breath contains water vapor

question: What sentence would provide a factual answer to this question: "A plane travels through what?"

answer: a plane travels through the atmosphere

question: What sentence would provide a factual answer to this question: "A thermometer would be used to"

answer:
a thermometer is used to measure temperature