lp gas or similarly pure butane gas volume expands to approximately 250 x its liquid volume varying of course by pressure temperature and gas chemistry or actual composition lp gas tank fill volume is typically to 80 85 % of capacity leaving vapor space in the tank
The good news is that six months after Laser Eye Surgery, you can, in most cases, wear coloured or cosmetic contact lenses. You will, however, need to see your optometrist before purchasing any coloured lenses as the shape of your eyes will have changed due to the surgery.
How long do you wear your contacts each day? the eye's do get tired and when you wear contacts there is less exchange of oxygen through the eye and less natural lubrication through tearing, so the tiny blood vessels in the eyes swell and that's where the feeling of sand might be coming from.