Because there is a large amount of empty space between gas molecules, the gas has the property

These gas molecules are much smaller than the distance between them.
So, most of the volume of a gas is therefore empty space.
There is no force of attraction between gas particles or between the particles and the walls of the container.
Because there is a large amount of empty space between gas molecules,the gas has property of low density.

A3.5 gap gps and your masters degree