Answer:
Intermolecular
Explanation:
Intermolecular forces are the forces operating between the two molecules. Â These forces are of short rang forces and also known as week intermolecular forces.
These forces only exist when molecules get close together by force of by cooling.
Example:
Hydrogen bond (intermolecular forces) exist in liquid water molecules but when we heat it the water molecule escape from surface by as hydrogen bond break by heating.
Compressed Natural Gas:
In this case the molecules of natural gas presses and the come closer so the distance between the molecules become less and force of attraction increase that attraction (intermolecular force ) is due to short distance.