Balloon -

Hot-air balloons are used for recreation and competition, relying on the principle that warm air is less dense than the cool air around it.

From simple party decorations to sophisticated scientific instruments, balloons have played a surprisingly significant role in human history and technology. At their core, a balloon is a flexible bag designed to be inflated with a gas—such as helium, hydrogen, or hot air—causing it to float or expand. A Brief History balloon

In procedures like angioplasty, tiny balloons are used to clear blocked arteries, saving lives through precision engineering. Environmental Impact Hot-air balloons are used for recreation and competition,