No, Hydrogen gas is less dense than Helium gas.
When heated, gases typically expand and become less dense. So, a gas would be least dense when heated.
solid, liquid then gas
Hydrogen (gas)Oxygen (gas)PumiceWater (liquid)GraniteSteelLeadGold
Gas giants like Jupiter and Saturn are the least dense planets in our solar system. They are made up mostly of gases like hydrogen and helium, making their overall density much lower compared to rocky planets like Earth and Mars.
The order is: - solid (the densest) - liquid - gas - plasma
When heated, gases typically expand and become less dense. So, a gas would be least dense when heated.
'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
Saturn is the least dense planet in our solar system.
The molecules are farther apart in a gas.
Hydrogen gas is considered the least dense element. It is less dense than air, which is why it is often used in balloons.
solid, liquid then gas
Hydrogen (gas)Oxygen (gas)PumiceWater (liquid)GraniteSteelLeadGold
Saturn is the least dense of the gas giants, even out of all of the planets in our solar system. Its average density is around 0.7 g/cc (less than water).
Oil will sink in water, so is the least dense.
Gas giants like Jupiter and Saturn are the least dense planets in our solar system. They are made up mostly of gases like hydrogen and helium, making their overall density much lower compared to rocky planets like Earth and Mars.
The order is: - solid (the densest) - liquid - gas - plasma