Properties of solids, liquids and gases：性能的固体，液体和气体[精品].ppt

Boardworks KS3 Science 2008 Solids, Liquids and Gases Boardworks KS3 Science 2008 Solids, Liquids and Gases Boardworks KS3 Science 2008 Solids, Liquids and Gases Photo credit: Sophie Collin Boardworks KS3 Science 2008 Solids, Liquids and Gases Boardworks KS3 Science 2008 Solids, Liquids and Gases Teacher notes The ammonia particles diffuse more quickly than the HCl particles because they have a lower molecular mass. Boardworks KS3 Science 2008 Solids, Liquids and Gases Boardworks KS3 Science 2008 Solids, Liquids and Gases Boardworks KS3 Science 2008 Solids, Liquids and Gases Boardworks KS3 Science 2008 Solids, Liquids and Gases Glossary diffusion – The process in which particles randomly move and spread out in gases and liquids. gas – The state of matter in which particles can freely move, and in which substances have no fixed volume or shape. liquid – The state of matter in which particles are close together but free to move, and in which substances have a fixed volume and assume the shape of their container. matter – The stuff that everything is made of. particle – The smallest unit of matter. pressure – Caused by the particles of a gas hitting the walls of its container. solid – The state of matter in which particles are close together and cannot move, and in which substances have a fixed shape and volume. state – The physical condition of a substance. Can be solid, liquid or gas. Boardworks KS3 Science 2008 Solids, Liquids and Gases Boardworks KS3 Science 2008 Solids, Liquids and Gases Diffusion in solids The particles in liquids and gases diffuse easily because they are free to move around. However, it is possible for solids to diffuse as well. Scientists have found that if they put two metals next to each other and leave them for a long time, eventually a few particles of one metal will diffuse into the other. This is because the particles in a solid vibrate, and some of them have enough energy to move around a little bit as well. Eventually,