If an objects volume increases, what happens to its density?
Density for each and every substance is defined and remains same. The density of solids is definitely going to remain same because they have fixed shape and volume. Same goes for the liquids. Density of gases is determined by the following: PM/RT = d where P is pressure, M is molecular mass, R is universal gas constant and T is temperature M and R are constant and cannot be changed. Whenever T, or P is changed, they both adjust there value such that P/T remains same. For example: suppose temperature is 50 Kelvin and pressure is 1 atm. then P/T IS 1/50. If temperature is increased to 100 K, then pressure automatically becomes 2 atm so as to maintain the 1/50 ratio. Hence density remains same.
