A gas balloon is a balloon that rises and floats in the air because it is filled with a gas lighter than air (such as helium or hydrogen). When not in flight, it is tethered to prevent it from flying away and is sealed at the bottom to prevent the escape of gas.

The pilot can gently bring the hot air balloon back to Earth by releasing heated air, thereby lowering the internal temperature of the balloon. However, the total weight a balloon can lift depends on the volume of hot air it contains.

Hot air balloons are based on a very basic scientific principle: warmer air rises in cooler air. Essentially, hot air is lighter than cool air, because it has less mass per unit of volume. A cubic foot of air weighs roughly 28 grams (about an ounce). If you heat that air by 100 degrees F, it weighs about 7 grams less.

For latex and foil balloons to float, they need to be inflated with helium. Helium is colorless, non-toxic, odorless, tasteless and doesn’t burn. To fill balloons with helium, you can use a Balloon Time helium tank or go to your local Party City store to have balloons inflated.

The air inside the balloon pushes really hard on the melted part and makes the weakness get bigger, so the balloon pops. When the balloon is filled with water, the water absorbs the heat. This stops the balloon from melting. Because there is no weak point, the balloon doesn’t pop.

By the low temperature the pressure of the gas inside the balloon tends to decrease. When the balloon is cooled, the volume of the balloon is greater, resulting in a greater average density of the balloon and helium. This makes the balloon come down.

Even though the gases inside and outside the balloon are approximately the same, the balloon material adds to the weight, causing it to sink down. The higher density of carbon dioxide makes it so that the buoyant force is way stronger on the balloon, which causes it to float!

The frozen balloon shrank because the average kinetic energy of the gas molecules in a balloon decreases when the temperature decreases. This makes the molecules move more slowly and have less frequent and weaker collisions with the inside wall of the balloon, which causes the balloon to shrink a little.

Balloons may be stored in a stand-alone freezer or in the freezer section of the refrigerator. Storing in the Refrigerator: Balloons may be stored in the refrigerator. In this case, and in the above case too, you should give your balloons time to naturally warm to room temperature before inflating.

Since the amount of air in a balloon is fixed, if you change its temperature its volume must change, and so must its size. So yeah: if you heat up a balloon, its circumference will get bigger, and if you cool it down, it’ll get smaller. Hope those help!