Gas is not dense, solids should be dense, liquids are dense, but not as much as solids.
Hydrogen is the least dense gas.
Hydrogen (gas)Oxygen (gas)PumiceWater (liquid)GraniteSteelLeadGold
Gas planets are least dense.
Helium is a gas that is less dense than air. This is why a balloon filled with helium rises when released.
The gas inside of a balloon is less dense than the air outside of it if the balloon floats. If the balloon does not float the density of the gas inside of it is equal to or more dense than that around it.
Hydrogen is the least dense gas.
gas
The gas phase is less dense than the liquid or solid phase of a substance. Density is not a property of sound.
Hydrogen (gas)Oxygen (gas)PumiceWater (liquid)GraniteSteelLeadGold
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 planets are least dense.
Gas
if you can put your hand through gas, the particles are not close together, and therefor is so lightly dense
air is more dense than helium
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.