What does the term density mean?

The degree of compactness of a substance.

Explanation:

You can look at the dictionary

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.