By fuel we usually means something that can be burned. The energy released(usually heat) in the burn can be converted to other, more useful forms of energy, like electricity, or mechanical energy(movement).
Natural gas is a fuel because it burns with air to produce heat, which is what fuels do.
Is natural gas fossil fuel
Your question makes no sense, natural gas IS a "fuel".
By natural gas we most often mean the fossil fuel which is formed as the lightest fractions of petroleum. It is mostly methane, which also occurs as marsh gas.
It is in air- it is a gas. So, yes it is a fuel.
It is in air- it is a gas. So, yes it is a fuel.
CNG is exactly the same fuel as natural gas, since CNG stands for "compressed natural gas".
Natural gas.
Natural gas is a preferred fuel because it is plentiful, cheap, and burns cleanly.
Propane natural gas, as distinct from Butane natural gas.
No.
No.