The upthrust exerted by surrounding air on the balloon.
if you mean how the hot air in a hot air balloon makes it rise, its because hot air is less dense than cold air. when cold and hot air meet the cold air sinks thus making hot air left to rise.so when you put hot air in a balloon the air would rise. hope this helps.
Because hot air rises and cold air sinks. So when they heat the air in the balloon it becomes less dense or less heavy and that makes it rise ad the volume becomes more. Because hot air rises and cold air sinks. So when they heat the air in the balloon it becomes less dense or less heavy and that makes it rise and the volume becomes more.
Hot air is less dense compared to cold air. The heated air in the balloon will rise, making the balloon float in the air.to make it rise.
The air... or so I think. x(
Hot air rises, and the air is hotter than the air outside the balloon causing it to rise.
If there is warm air in the balloon, cooler air makes the balloon rise and if there is cold air in the balloon warmer air makes the balloon fall.
it runs on propane.
When the gas (air) in a hot air balloon is heated it becomes less dense. This makes the balloon more buoyant so it rises.Because heating the air inside the balloon makes it less dense than the air surrounding the outside of the balloon, so it will rise.
The hot air, inside of it is very light and makes the balloon rise up.
Erm.. no.. i believe its Buoyancy... this force causes u the hot air balloon to rise.. not Gravity..
Helium. The helium gas in the balloon is lighter than the air outside the balloon.
The heating of the air through the use of a burner is what makes balloons rise.
It rises because when thermal engery is in the balloon it makes an expansion that makes the balloon fly
It rises because when thermal engery is in the balloon it makes an expansion that makes the balloon fly
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).
Hot air rises. As the air in the hot air balloon is made hotter than the surrounding air it rises.
Hot air rises. By heating the cool air in the balloon using a propane heater, heats the air and makes the balloon rise