Objective Second grade students will how heat affects air. Materials Experiment 1 Empty soda bottle round balloon Motivation Teaching children that energy affects many aspects of our lives. Snap the balloon opening over the bottle opening. Wrap both hands around the bottle to warm it. Let a partner help, too.
Students can mark their answers on a worksheet.
Independent Practice Have children write down their results on a piece of paper. Closure Ask the children what they have learned today. Remind them that temperature is a measure of the average speed of molecular movements. When increased heat energy is applied, its molecules vibrate faster. If the motion is powerful enough to overcome the molecules' cohesive forces, the molecules move farther away.