Large volumes of CNG is filled in small cylinders easily due to which property of gases?
low specific gravity
The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.
Diffusion is the property of gases where gas molecules go from higher concentration to lower concentration. Low specific gravity and their light weight do not come into play in this scenario.