Question

state the approximate spacing between two molecules of a matter?

Answer 1

In our universe at our radius, the normal mass density is 0.3 GeV/c^2/cm^3. This implies in the normal each cubic centimeter in our universe there is 1/3 of a hydrogen molecule (plus or minus). Since the volume of a particle is a cubic Angstrom, this implies just 1 section in 10^30 is involved all things considered. 

In the event that you take a look at the Universe on a bigger scale, we have more matter in our world than normal by a variable of 10^5, implying that exclusive 1 section in 10^35 is occupied. 

In the atmosphere, the thickness of air at standard temperature and weight are 1/1000th of strong matter, implying that about 1/1000 of the volume is filled.