Answer: Hot air is less dense than cool air; the heated air causes the balloon to rise simply because it is lighter than an equal volume of cold air. Buoyancy is an upward force that the air exerts, and it helps hot-air balloons and blimps stay in the air. A hot air balloon uses a burner to heat up the air inside the balloon.
Compered to most of Europe and Russia it was fresh into the war and it proposed the idea of the Trey of <span>Versailles.</span>
The quarantine speech was an intervention
