Fact 1: If gas is heated then that gas will expand. Fact 2: If a material is heated, it expands and the density decreases. Given the two facts above, answer the question "When does a gas's density decrease?" with the following options: - Time and energy - cool off - Dehydration - air cools - It becomes dormant - Evaporation - Dilution - When it's heated
A:
When it's heated