Gas is not dense, solids should be dense, liquids are dense, but not as much as solids.
When heated, gases typically expand and become less dense. So, a gas would be least dense when heated.
Helium is a gas that is less dense than air. This is why a balloon filled with helium rises when released.
Hydrogen (gas)Oxygen (gas)PumiceWater (liquid)GraniteSteelLeadGold
solid, liquid then gas
No. Radon is a dense gas.
When heated, gases typically expand and become less dense. So, a gas would be least dense when heated.
gas
The gas phase is less dense than the liquid or solid phase of a substance. Density is not a property of sound.
Because hydrogen gas is less dense than air(mostly nitrogen and oxygen), and the less dense gas flows to go above the more dense(and escape the atmosphere).
'Least' is a comparison word. Compared to iron and lead yes cotton is least dense. Compares to oxygen gas and hydrogen gas, no it is not least dense.
Gas
air is more dense than helium
Gas is less dense compared to liquids and solids because the molecules in a gas are much farther apart, allowing them to move freely and fill the container they are in. This results in low molecular attraction and less mass per unit volume, making gas less dense.
Helium is a gas that is less dense than air. This is why a balloon filled with helium rises when released.
Gravity. Note that mostly it wasn't all that dense.
The molecules are farther apart in a gas.
Hydrogen (gas)Oxygen (gas)PumiceWater (liquid)GraniteSteelLeadGold