Answer:
One experiment that shows that gas has a low density is the displacement of water by a gas. To do this experiment, take a container filled with water and place a balloon filled with gas (such as hydrogen or helium) on top of the water. The balloon will displace the water, and the amount of water displaced will be equal to the volume of the balloon. This experiment shows that gases have a lower density than liquids, since the balloon is able to displace a greater volume of water than its own volume.
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