the density of a liquid can be calculated by dividing the mass over volume & a graduated cylinder can measure a liquid's volume & a balance can measure a liquid's mass ->  density can be measured using a graduated cylinder and a balance  density can be measured using a graduated cylinder and a balance & density can be used to predict whether a liquid will float on water or sink under water -> a graduated cylinder and balance can be used to predict whether a liquid will float on water or sink on water