Methane is another word for natural gas
gallon
Oxygen.
s
electricity, ammunition, combustible, gas, food, means
air
air
Another name for a gas mask is APR or Air Purifying Respirator.
another word for air sac is alveolus.
Yes, the word 'bubble' is a noun, a singular, common, concrete noun; a word for a thin sphere of liquid enclosing air or another gas; a word for a thing.
Vapor
another word for gas.
in the open air
Another word for a noble gas is an inert gas. These elements have the maximum electrons in their highest energy level.
air
Methane is another word for natural gas
gallon