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
The heating of the air through the use of a burner is what makes balloons rise.
The hot air from the burner rises since it has little density, and then is caught in the balloon, which causes it to rise.
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.
To increase enthalpy.the burner uses flames to heat the air so the balloon will rise
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.
As the flame burns it heats the air around it making the air less dense than the cooler air above, the warm air particles rise to the top of the balloon and the balloon rises with the air. Essentially a hot air balloon uses a convection current to stay in the air.
A hot air balloon can stay in the air because the hot air is less dense than cool air. The hot air that is blown into the balloon causes it to rise and a burner is used to heat the air inside of the balloon to keep it floating.
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.
The intense heat of the burner alters the atomic nucleus of the oxygen atom into a synthetic helium atom causing the balloon to rise. The helium atom is less dense than the original oxygen atom.
The balloon will crash. The burner keeps it up.
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.
A gas burner is used in the hot air balloon to heat air. When heat is applied, particles tend to expand. Due to this the air surrounding the balloon is cooler than the air inside it, making it to rise.