Helium (Hydrogen could also be used but this is flamable). Not some balloons are also kept aloft using hot air.
Gases used are: air (and hot air), helium.
Helium is a gas used to inflate lighter than air balloons.
Helium is commonly used to fill balloons. It is non-flammable and lighter than air, allowing balloons to float.
Helium is used for the ones that rise. Compressed air can be used or exhaled breath.
Helium is typically used to fill airships and balloons due to its low density, which allows them to float in the air.
Helium is used in blimps and balloons. It is the second lightest element to hydrogen, which is not used because it is highly flammable.
Helium is the gas usually used now. Hydrogen works, but is inflammable and so dangerous. There are also hot air balloons which require a heater to create the hot air and keep it hot.
Helium gas , because helium is the most inert element of all, and does NOT ignite, and allows balloons to float. If carbon dioxide was used, then the balloons would fall to the floor. Hydrogen is NOT used , because it is flammable and explosive, when mixed with air.
Helium is the element commonly used to fill balloons to make them float. It is lighter than air and creates lift within the balloon, causing it to rise.
Helium gas is most commonly used to fill balloons to make them float. Helium is lighter than air, which causes the balloon to rise and float.
Hot air balloons primarily use heated air to achieve lift. The envelope of the balloon is filled with air that is heated by a burner, typically fueled by propane. As the air inside the envelope warms, it becomes less dense than the cooler air outside, causing the balloon to rise. Therefore, while hot air is the key element, propane is commonly used as the fuel source for heating it.
Meteorological balloons are made from natural latex rubber, mostly in Japan.