Why do hot air balloons rise?

What makes hot air balloons rise in the sky?

Is it due to the temperature of the air inside the envelope?

Answer:

Yes, hot air balloons rise in the sky because of the principle of buoyancy.

Hot air balloons rise in the sky due to the principle of buoyancy. When the air inside the envelope is heated, it becomes less dense than the cooler air outside. This difference in density creates a buoyant force that causes the balloon to rise. The hot air inside the envelope displaces the cooler air, creating lift.

The burner in the basket of the hot air balloon heats the air inside the envelope, increasing its volume and reducing its density. The hot air becomes lighter than the surrounding cooler air, causing the balloon to rise. As long as the burner continues to heat the air, the balloon will remain aloft.

So, the temperature of the air inside the envelope plays a crucial role in making hot air balloons rise in the sky.