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When you light the burner of a hot air balloon, the balloon itself, the big bag-like part, fills with hot air which is less dense than the air in the surrounding atmosphere. The air being less dense inside means the molecules are spread apart further that normal, so it rises and, being inside the bag-like part of the balloon, it brings the balloon, the basket, and the basket's contents with it.

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Q: Why a hot air balloon rises up when it lights its burner?
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What gas do we fill in hot air balloon?

Hot air balloons are filled with hot air from a propane burner in the basket. Hot air rises. So provided the cooling air in the balloon is topped up from short blasts from the burner, the balloon will rise off the ground.


Why does the heating of gas cause a hot air balloon to rise?

Because hot air rises and a hot air balloon utilizes this. As the hot air rises it lifts the balloon so that it lifts off from the ground. And the reason why the hot air balloon has a burner, the thing that is connected to the balloon itself and shoots flame into it, is because the hot air inside the balloon begins to cool causing it to fall so the burner reheats the air so that it doesn't return back to the ground.


Explain how a hot air balloon is lifted from the ground?

In a nutshell, air rises and expands when heated. Through the use of a burner the balloon pilot heats up the air inside the envelope (the balloon itself), this air inside the envelope expands and rises, lifing the basket.


What is the name of the gas that is filled in hot air balloons to make them soar and rise up in the sky?

In a "hot air" balloon, which you refer to in your question, the gas is hot air. Heated air rises, so the balloon rises. The gas used in the burner, to heat the air, is propane.


If you were to turn on the burner on in the hot air balloon what effect would it have on the air in the balloon?

When the burner on a hot air balloon is turned on the air inside the balloon is heated making it less dense. This will cause the balloon to be more buoyant and climb.

Related questions

Why does a gas burner in a balloon begin to rise when heated air is trappd inside the balloon?

The hot air from the gas burner rises and enters the balloon's envelope. Once there is enough hot air trapped, the whole balloon will begin to lift off the floor. This is due entirely to the fact that hot air rises.


How does hot air balloon stays up?

The air inside the balloon is heated with a propane burner. As air is warmed, it becomes less dense (lighter) and rises.


What gas do we fill in hot air balloon?

Hot air balloons are filled with hot air from a propane burner in the basket. Hot air rises. So provided the cooling air in the balloon is topped up from short blasts from the burner, the balloon will rise off the ground.


Why does the heating of gas cause a hot air balloon to rise?

Because hot air rises and a hot air balloon utilizes this. As the hot air rises it lifts the balloon so that it lifts off from the ground. And the reason why the hot air balloon has a burner, the thing that is connected to the balloon itself and shoots flame into it, is because the hot air inside the balloon begins to cool causing it to fall so the burner reheats the air so that it doesn't return back to the ground.


Explain how a hot air balloon is lifted from the ground?

In a nutshell, air rises and expands when heated. Through the use of a burner the balloon pilot heats up the air inside the envelope (the balloon itself), this air inside the envelope expands and rises, lifing the basket.


Why are hot air balloons able to rise into the air?

The hot air from the burner rises since it has little density, and then is caught in the balloon, which causes it to rise.


What is the name of the gas that is filled in hot air balloons to make them soar and rise up in the sky?

In a "hot air" balloon, which you refer to in your question, the gas is hot air. Heated air rises, so the balloon rises. The gas used in the burner, to heat the air, is propane.


Why does an hot air balloon rise up when you light the burner?

It all has to do with the gas law PV=nRT. When the Temperature "T" increases, the volume of the gas increases which inflates the balloon. It rises because this now warm gas rises through the cooler surrounding air. Warm air rises, cool air sinks


Why do helium and hot air balloon's rise?

Because helium is less dense than air, so it rises. Hot air balloons rise because heated air from the burner becomes less dense and therefore rises.


If you were to turn on the burner on in the hot air balloon what effect would it have on the air in the balloon?

When the burner on a hot air balloon is turned on the air inside the balloon is heated making it less dense. This will cause the balloon to be more buoyant and climb.


When the balloon is floating high above the ground how could the balloonist make the balloon descend gradually?

the balloonist would turn off the burner, allowing the air inside the balloon to cool down. Hot air rises so as the air cools down the balloon will lose altitude.


What happens if the air balloon burner was turned off?

The balloon will crash. The burner keeps it up.