Gas
We cannot see gas.
But gas can fill things up, like a balloon, a tire, and a bubble!
Air is a gas.
We cannot see air.
But we can feel it when the wind blows!
Steam is a gas.
Water can be heated. When it boils to a certain heat, it becomes a gas.
It can go back to being a liquid and solid when cooled or frozen.
Gas expands.
This means it get bigger.
Matter is made of molecules.
As gas expands, the molecules move farther apart!
gas
Matter can be a solid, liquid or gas.
Gas expands.
This means it get bigger.
Matter is made of molecules.
As gas expands, the molecules move farther apart!