I think it’s A, the particles of gas inside the ballon move faster and decrease pressure in
Density is an intrinsic property, so it is independent of the amount of substance present: one gold coin would have the same density as a solid gold boulder.
So if the density of gold is 19.3 g/cm³, the density of a bar of gold and the pieces into which the bar is cut would all be 19.3 g/cm³.
Everything requires energy to move. If the desk is moving, then it has energy.
Liquid :) it goes directly from a solid to a gas. Have a nice day!
