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Hot air balloons use hot air because hot air rises above cold air. The air inside the balloon is heated above the temperature of the air outside the balloon. The warmer air trapped inside the balloon then causes the balloon to float above the outside colder air.

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15y ago

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Why does a balloon need hot air?

A balloon needs hot air to make it rise because hot air is less dense than cold air. When the air inside the balloon is heated, it becomes lighter and causes the balloon to lift off the ground and float in the air.


How do you make a balloon rise into the air?

To make a balloon rise in the air, one way is to fill it with a lighter-than-air gas, such as helium or hydrogen. The gas inside the balloon is less dense than the surrounding air, enabling it to float and rise. The amount of gas and the size of the balloon will determine how high it can rise.


What would heating the gas in an air balloon make the balloon rise?

Simple...hot air rises..


What chemicals from the periodic table make a hot air balloon rise?

There are many chemicals found in a hot air balloon to make it rise. The main elements/chemicals are Helium and Hydrogen.


Would a hot air balloon pilot heat or cool the air in the balloon to make it rise?

He would heat it.


How does helium make a balloon rise when air doesn'?

Helium is lighter than air. So helium balloon rises in air.


Why would a hot air balloon pilot heat the air in the balloon to make it rise?

Heating the air in the balloon makes it less dense than the surrounding air, causing the balloon to become buoyant and rise. As the air inside the balloon cools, it becomes denser and the balloon descends. This process allows the pilot to control the altitude of the balloon.


Why does hot air balloon need fire so that it can fly?

A hot air balloon needs fire to heat the air inside the balloon. Heating the air makes it less dense than the surrounding air, causing the balloon to become buoyant and rise. The fire is used to maintain the temperature of the air inside the balloon to keep it flying.


Why can air balloon rise to the sky?

it can rise because of the helium and the gases help make it rise to the sky


How do convection currents make a hot air balloon to rise?

because the air becomes less dense and spreads out so becomes hotter and hot air rise so the balloon does.


Why does heating the air in hot air balloon make it rise?

Hot air is lighter than cold air, so cold air sinks and hot air rises; that makes the hot air balloon rise (if the air around the hot air balloon is heated as well, it won't rise, or sink if in the air).


How do you make air lighter so that it will cause a balloon to rise?

To make air lighter, you can heat it up. Hot air is less dense than cold air, so it rises. When you heat the air inside a balloon, it becomes lighter than the surrounding air and causes the balloon to float upward.