density a measure of how tightly packed particles are in an object
mass a measure of the amount of matter in an object
volume a measure of the amount of space an object takes up

Density Formula

Mass divided by volume
Mass # always goes into the calculator first even if it’s smaller
EX: If mass is 5.0 g and volume is 20.0 cm3 then d = 0.25 g/cm3


Three Important Density Facts

  1. Density does not change if you cut an object into pieces.

  2. Density can help predict whether an object will float in a liquid.

  3. Density values can predict where an object can float in water.

How is Volume Calculated?

How is Density Calculated?

g/cm3 = g


Will It Float in These Liquids?

An object will float in a liquid if its density is less than (or equal to) the liquid's density. If the object has a greater density, then it will sink.



Water has a density of 1.00 g/mL. To determine how high or how low an object will float in water, simply multiply the object's density by 100. That will tell you what percent of the object is in the water. The rest will be above the water line. Any percent greater than 100, then the object will sink to the bottom.

Where Will It Float in Water?