Because hydrogen is EXTREMELY flammable and can burn from a wide range of air concentrations. It is more flammable than gasoline.
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Hydrogen is highly flammable and poses a safety risk when used in air balloons. Helium, on the other hand, is non-flammable, making it a safer choice for lifting balloons. Despite being less buoyant than hydrogen, helium is commonly used due to its safety properties.
Hot air balloons are lifted by heating the air inside the balloon envelope using a burner, while hydrogen gas balloons are lifted by the buoyancy of the hydrogen gas they contain. Hydrogen gas balloons are typically able to achieve greater altitudes compared to hot air balloons, but must be handled with caution due to the flammability of hydrogen gas.
Hot air balloons are typically filled with heated air, which is lighter than the surrounding air and provides lift. Some balloons may also use helium or hydrogen gas for buoyancy, but hot air is the most commonly used lifting gas for traditional hot air balloons.
Balloons float in the air because they are filled with a gas that is lighter than the surrounding air. This gas, typically helium or hydrogen, creates buoyancy, causing the balloon to rise and float.
Hydrogen is lighter than the air around it, which creates a buoyant force that causes the balloon to float. This is due to the differences in density between hydrogen gas and the surrounding air.
A hot air balloon uses heated air to generate lift, while a gas balloon uses a lighter-than-air gas, such as helium or hydrogen. Hot air balloons are propelled by wind currents, while gas balloons can be steered to some extent using ballast and vents. However, gas balloons typically have longer flight durations compared to hot air balloons.