Gas
/ɡæs/noun
A substance that is like air and usually cannot be seen.
Carbon dioxide is a type of gas.
Often appears as...
- natural gas
- greenhouse gas
Definition 1 of 6
Pro Tip 1/3Intangible substance
Understand that 'gas' refers to something you can't hold like solids.
The helium gas inside balloons is lighter than air.
Pro Tip 2/3Invisible 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.
Pro Tip 3/3Environmental 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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