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Science 7 – Chapter 13 Define melting. Define freezing. Define boiling. Define condensation. Define evaporation. Define solidification. How are a gas, liquid, and solid different? What are some examples of a gas? Of liquids? Of solids? What is a variable? What is a hypothesis? The change from a solid to a liquid, like ice to water or rock to lava. When temperatures are cold enough to turn something from liquid to solid, like water to ice. When the temperature is hot enough to turn something from liquid to gas, like water to air. The change from gas to a liquid, like air to water. The change from a liquid to a gas, like water to air. When a liquid changes to a solid, like lava cooling to become rock. Gas can be pushed into a smaller space; liquid cannot. Liquids flow and take the shape of their container. Solids do not flow. Air, oxygen, bubbles. Water, coke, honey, lava. Ice, rocks, wood. A part of an experiment that can change. It is usually tested separately. An explanation for an observation (something you see) that you can test. 49 Jan Osier, TIPS Coordinator, Bavaria District, 2003-2004