The forces in gases are weaker than forces in solids and liquids.
Because they have more kinetic energy that overcomes the force of attraction.
14 uranium atoms in pure uranium
Go to google and look up how are air bags changing for number 2. and look up new airbag technologies in google and rewrite that in a few paragraphs for number 3.
Volume of a cube = mass/density
mass=100grams
density=1g/cm^3
volume is therefore= 100grams / 1gram/cm^3= 100cm^3