# Why do helium balloons rise?

WHy do helium balloons rise?

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Helium balloons rise because the gas Helium inside it is less dense than air.

The air we breathe is 80% Nitrogen which weighs 1.2506 grams per liter.

Helium weighs 0.1785 grams per liter.

The Helium balloon will rise until it reaches the air that is less dense than the Helium balloon.

Just like in water, the most dense object will stay at the bottom, the less dense will float and create layers like if you were to do an experiment using 1/4 cup plain water, 1/4 cup sugar water, 1/4 cup salt water, and 1/4 cup rubbing alcohol with each liquid with a different food color. After you got your colored different liquids ready, you pour one at a time into a glass and you will let it set and watch the colors separate showing you the separation of the different liquids and telling you which is liquid is denser than the other.

This is the law of buoyancy. And we can swim/float in water because water is heavier than we are. So Helium balloons are less dense than the air we breathe and it makes the Helium balloon to float or rise.

Helium balloons rise due to density. The density of helium is relatively close to the air's, but when most elements are cooled, their density increases. This means that when these elements are heated, their density increases. Helium balloons stay on the ground, BUT when the people in the balloon turn on the fire to heat the helium the density decreases to less than the air and the balloon floats up into the sky.

Helium is lighter and less dense than air, and so it rises to the top of the "mixture of air and helium".

Compare this to putting oil into water. The oil goes to the bottom because it's MORE dense than water, so the water rises to the top.

• Anonymous

Helium is a gas that is lighter than air.

Source(s): Common knowledge. http://en.wikipedia.org/wiki/Helium