Density

Density= Mass Volume D= m V

Mass Mass: Amount of matter in a substance. Don’t confuse with weight. Weight: the force with which the earth pulls on the substance.

Question Which weighs more? 50 kilograms of iron Or 50 kilograms of feathers

Question Which has a greater density? iron Or feathers

Common Units of Density Density= Mass Volume g/mL = g/cm 3 kg/m 3 1 cm 3 =1 mL 1 dm 3 =1L

Densities of Common Substances

Density as a Function of Temperature For most substances, as temperature increases the volume increases and as a result the density decreases.

Density of Water

At 4 o C water has its maximum density of 1g/cm 3 Convert to kg/m 3 : 1000kg/m 3

Note Density is an intensive physical property. (Does not depend on amount of matter in the sample)

Density Column

Galilean Thermometer