
Gas
Intangible substance
Understand that 'gas' refers to something you can't hold like solids.

The helium gas inside balloons is lighter than air.
Invisible but real
Remember gases may be invisible but they can have effects, like oxygen we breathe.

Gas leaks can be dangerous even though you can't see them.
Environmental impact
Some gases can contribute to environmental problems like global warming.

Factories can emit harmful gases into the atmosphere.
Compare with
DieselFuelHydrocarbonMethanePetrolPropane
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