Gases Fastest Moving Particles Not definite shape Not Definite volume Fills the shape of the container Particles can be far apart Particles move quickly hitting each other High Compressibility

More Properties of Gases Gases have pressure Pressure comes from particles hitting the sides of the container More molecules or faster particles  more pressure Gases can flow They can go through pipes or be poured Gases and liquids are both fluids

Review of Phases of Matter Solid Liquid Gas Definite Volume Definitive Volume Not definite Volume Definite Shape Not Definite Shape Particles Vibrate in Place Particles move around each other, can be poured, is a fluid Particle spread out and hit each other and the container causing pressure, is a fluid (can be poured)

Changes in Matter Physical Properties of Matter: Physical Changes Things you can measure about matter Ex: Color, Density, Hardness Physical Changes A change in shape or state of matter Ex: Water Freezing Dissolving sugar in Water Does not change the composition of the matter