Not true. That would mean that a deflated balloon would fly as well. It's about density (mass unit per volume unit). Inflating the balloon with a gas lighter than Oxygen, like Helium, makes the volume raise drasticly without raising the total mass significantly. Another way is too increase the temperature of the air in the balloon, thus increasing volume while keeping the mass constant which in return decreases the density, allowing it to float in the air... But seriously, balloons have immunity to gravity!
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Not true. That would mean that a deflated balloon would fly as well. It's about density (mass unit per volume unit). Inflating the balloon with a gas lighter than Oxygen, like Helium, makes the volume raise drasticly without raising the total mass significantly. Another way is too increase the temperature of the air in the balloon, thus increasing volume while keeping the mass constant which in return decreases the density, allowing it to float in the air... But seriously, balloons have immunity to gravity!