Presentation on theme: "2.2 Density Density describes how much mass is in a given volume of a material."— Presentation transcript:
1 2.2 DensityDensity describes how much mass is in a given volume of a material.
2 2.2 DensitySolids, liquids and gases are matter, so they all have density.The density of water is about one gram per cubic centimeter.What is less dense than water?Write down at least 1 thing.
3 2.2 DensityThe 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.
4 2.2 Density Density changes for different substances because: Atoms & molecules are bigger or smaller.Atoms may be “packed” tightly or loosely.
5 2.2 Density of common materials Density is a characteristic property of the type of matter.The size and or shape of the sample doesn’t matter.
6 2.2 Density of common materials Liquids tend to be less dense than solids of the same material.
7 2.2 Determining DensityTo find the density of a material, you need to know the mass and volume of a solid sample of the material.Mass is measured with a balance or scale.Use the displacement method or calculate the volume if it is an irregular shape.