What is the density of gas?

Answer 1

Asking "what is the density of a gas" is just like asking "what is the density of a liquid or solid". This entirely depends on what gas it is and only in the case of gases, what temperature and pressure it is at too.

Answer 2

Here's what happens when some quantity of a gas is compressed into a cylinder.

(The term "amount" in the question is rather slippery.)

-- The mass of the gas doesn't change.

-- The weight of the gas doesn't change.

-- The density of the gas increases.

-- The volume of the gas decreases.

-- The temperature of the gas, or its pressure, or both, must increase.

-- The cost of the gas most likely increases too.

Answer 3

when a gas is compressed its volume decreases if we decrease it slowly then we say that it is isothermal compression therfore PV=comstant otherwise PVY=cons

Answer 4

increases

Answer 5

Doubles.

Answer 6

increases