DensityHow compact is the material?

How close the atoms or molecules are to each other

More than“heaviness”- density includes how much space an object takes up!

All substances have density including liquids, solids, and gases

Density is the measure of the “compactness” of a material

“Compactness”

DensityDensity describes how much mass

is in a given volume of a material.

Mass is the amount of matter in an object (usually measured in grams)

Volume is the amount of space an object takes up (usually measured in ml or cm3)

Density Equation

D = mv

Given:mass = 1500 g; volume = 1700 mL

Equation: D = m/v

= .88 g/mL

Solve: 1,500 g ÷ 1,700 mL = 0.8823529 g/mL

A solid wax candle has a volume of 1,700 mL. The candle has a mass of 1.5 kg (1,500 g). What is the density of the candle?

Word problems

What do you think?

If the volume stays the same and the mass increases . . . the density will

If the mass stays the same and the volume increases . . . The density will

increase

decrease

The units used for density depend on whether the substance is solid or liquid.

◦For liquids use units of grams per milliliter (g/mL)

◦For solids use density in units of g/cm3 or kg/m3.

Units for density

Density of common materials

Liquids tend to be less dense than solids of the same material. ◦Ex. solder

• Water is an exception to this rule.

• The density of solid

water (ice) is less than the density of liquid water.

Density of common materials