Of course, this is a rather extreme example; most of us will never experience gold in its gaseous form. But everyone in the class will be familiar with water moving through the three states of matter: turning from solid ice to liquid water (0 °C), then to its gaseous form, water vapour (100 °C). So as well as expanding them, heat can also cause substances to change state. Different substances require different amounts of heat to do this: it takes more heat to boil gold than to boil water. But in theory at least, all substances can exist in the three states of matter.
I attempt to survey ways of thinking about, bringing into context, and interrogating the changing meaning of race in the United States. My intent is to raise a series of points to be used as frames of reference, to facilitate and deepen the conversation about race.
Each of the five experiments relies on simple materials and is suitable for pupils aged 7-11 (although note that the reviewer suggested the article is suitable for pupils aged 10-13). When used together, they could occupy your class for a whole day, but they could also be split up and used in separate lessons. Before starting, ask your students to think about .
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The temperature determines the state of a substance. When heated enough, a solid changes to a liquid, and a liquid to a gas. These changes of state take places because the molecules, or tiny bits of matter than make up the substance, vibrate faster when the substance is heated (kinetic energy increases). When the molecules vibrate faster, the attractive forces that hold the molecules together are broken. When cooled (this is the process of losing heat), a gas changes to a liquid, and a liquid changes to a solid.