of five rocks. Density. Basalt 3'0144 c = 0'1763 + 0'000396t [between 0° and 60'J c = 0-1946 + 0'000575 (t — 60) [between 60° and 110°] k = 0'00317 1+0'0000lt - Marble 2'7036 c = 0'20279 + 0 ...

If something seems light for its size (like a bag of cotton or pumice rock), then we say it has low density. Mass is the amount of matter in an object. Volume is how much space the object takes up.