Gas expansion and contraction

Spanish Version

In this experiment we are going to demonstrate that the volume of a gas can vary depending on its temperature

On the video in the right, Juan shows us a glass ampoule, attached to a tube of the same material, both full of air. One side of the tube is submerged in water (which he has previously poured into a glass). Then, he heats the ampoule with a candle. At this point, we can see that bubbles start to come out from the pipe. Now, when Juan moves away the candle, the air inside will begin to get cooles, and due to the fact that it is a gas, it will begin to get smaller. Pressure comes down, so the water starts to seep into the tube.