Question

topic 2 assessment
28 of 30 19:42 / 40:00
which of the following is a vapor?
helium
oxygen
hydrogen
steam

Explanation:

A vapor is a substance in the gas - phase that is normally a liquid or solid at room temperature. Steam is water in the gas - phase, and water is a liquid at room temperature. Helium, oxygen, and hydrogen are gases that are not normally liquids or solids at room temperature.

Answer:

D. steam