If a vacuum is empty, how can it have a volume ?

Question

Nothingness cannot occupy space because it does not exist.. But a vacuum does occupy a space - and transmits light !!

Answer 1

An absolute vacuum is impossible. Even space has a few molecules per cubic metre.  If you take a "empty" vessel into space and open it, it will fill with whatever is contained in space.

If this is then taken back into the spaceship at "normal" pressures, the vessel still contains "something" but at a VERY low pressure!!

Light can travel through any "transparent medium whether of not it contains other materials (solutions, glass, other gases)

Light is not "transmitted" by a vacuum since a source (light bulb, led, hot wire, etc) is needed to transmit light, light just passes through a vacuum  

Answer 2

A total Vacuum IS a space containing no Matter but is available for a substance to fill it.

"All Matter has Mass and Occupies space".

A space devoid of all matter is a Total vacuum but is still available space.

(However, Total vacuum doesn't exist,  there are some extraneous gas molecules and atoms floating around out there in space).