How is Avogadro's law used in everyday life?
Avogadro's Law states that the volume of a gas is directly proportional to the number of moles of gas.
Here are some examples.
As you blow up a basketball, you are forcing more gas molecules into it. The more molecules, the greater the volume. The basketball inflates.
A flat tire takes up less space than an inflated tire, because it contains less air.
Lungs expand as they fill with air. Exhaling decreases the volume of the lungs.
A balloon filled with helium weighs much less than an identical balloon filled with air. Both balloons contain the same number of molecules. Helium atoms have lower mass than either oxygen molecules or nitrogen molecules in air, so the helium balloon is lighter.
Hope this helps.