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What makes balloons float?

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How do different air pressures effect how a balloon reacts? Does it matter what the balloon is filled with? Find out here! read more

Make Balloon Float Without Helium It might not be an option for party decorations, but another way to make a balloon float is with hot air. A hot air balloon consists of a large bag, known as an envelope, with a wicker basket hanging underneath. read more

| MIT Video *In a rubber balloon, internal air is actually slightly more dense (and therefore heavier) than the surrounding air induced by the squeezing of the balloon itself. The slightly higher density and weight of the rubber causes the balloon to fall. read more

When anything like a balloon is filled with a gas that is lighter than the air regarding its density, then the balloon will float. Now it is known that the density of hydrogen and helium gas is lighter than that of air. So, if a balloon is filled with any of these gases, the balloon will float. read more

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Floating in General
science.howstuffworks.com

Why do helium balloons float?
askascientist.co.uk