Gas, also known as a gas (English: gas).
, is a state of matter (including solids, liquids, gases and plasma).
, which becomes solid when the temperature drops.
, so When adding energy in form of heat into a solid (like ice).
, it will melt into a liquid (ie water) at first, and then to boil.
, or evaporate into a gas (ie, water vapor) in the solid state. (eg, ice)
can be transformed directly to gas is called sublimation.
, if the gas is heated further. Atoms or molecules of the gas will become ionized.
, and change from a gas to a plasma state.
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