And in 1811, he concluded that “equal volumes of all gases, at the same temperature and pressure, have the same number of molecules.” This is Avogadro’s Principle. He studied the relationship between the volume of a gas and the number of particles. This was the question Amedeo Avogadro was interested in. Are they filled with the same number of particles? Does it matter that one balloon is filled with helium while the other is a mix of molecules? After all, helium atoms are much smaller and lighter than the molecules in air. But it’s much harder to answer why they have the same volume. We can easily observe that these two balloons are the same size. Now, imagine you inflate a second balloon, but this time you use helium to fill the balloon to 1 liter. As you exhale, molecules of nitrogen, oxygen, and carbon dioxide push into the balloon, expanding it to a new volume, let’s say 1 liter. ![]() Hi, and welcome to this video on Avogadro’s Principle.
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