The experiment demonstration requires a long bottle such as a carafe; a large jar or container into which the carafe can fit; food coloring and a plate. The demonstration requires that you fill the plate with water and add food coloring to it. Mix the solution with a spoon. Next, fill the large jar or container with hot water and place the carafe inside the bottle of hot water. Wait 30 seconds, then set the warmed carafe upside down in the plate of colored water. Observe what happens; the water should rise slowly into the bottle. Discuss with students the procedure of the experiment and have them predict what will happen as a result of performing it. Next, present the experiment in front of the class. Ask students what happened in the experiment. They should respond with, "The water rose into the carafe." Next, explain to students that when air cools it takes up a smaller space, or contracts inside a container. Continue by pointing at the upside down carafe with water in it while explaining that the air cooled in the carafe, leaving some room for the water to flow upward into the bottom of the carafe.
For this experiment you'll need a candle, an inverted bottle or jar (jar that is narrow at the top and wider on the bottom), a plate and food coloring. Place the candle in some melted wax (obtained from the candle) on the plate and light it. Put the inverted bottle over the candle. Have students observe what happens to the water on the plate (it will bubble up). Let the bottle cool and have students observe again. They'll notice that the water is sucked up into the bottle, making it a vacuum.
Obtain a large bag from the local cleaners and a can of cooking fuel from the hardware store. Open the bag and staple all around the opening (this is to give it weight on the bottom so it rises straight up). Open and light the can of cooking fuel. Place the bag over the lit can. The balloon will fill up with hot air and rise to the ceiling. When the air inside the balloon cools it will fall down. The cooler air contracts and moves down out of the balloon so that the balloon falls.
In this experiment, you'll need an inverted bottle, four balloons, hot water, a refrigerator-freezer, ice water and a large bowl. Begin by having three students each blow up one of the three balloons. Write A on the first balloon, B on the second, C on the third and D on the fourth, which is not blown up. Put balloon A in the freezer, B on a student's desk, C in the refrigerator and D over the top of the bottle. Pour hot water into the bowl and place the bottle inside it. Describe what happened to balloon D. Wait 30 minutes and then look at what happened to balloons A, B and C. Describe what has happened. Finally, take the bottle with the balloon on top and set it aside. Empty the bowl and then fill it with ice water. Put the bottle with the balloon on top inside the bowl. Observe what happens.