Why we say that gases has no fixed volume ?

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Solution

Dear Student
. A gas is a substance with no
definite volume and no definite shape. Solids and liquids have
volumes that do not change easily. A gas, on the other hand, has a vol-
ume that changes to match the volume of its container.
It is very easy to determine that gase do not have fixed shape and volume.

Take small amount of gas in a closed beaker and measure its volume.
Now Transfer the gas in to a big beaker and measure its volume.

You will see that the volume has changed which shows that gases do not have fixed volume.

We also observed that the gas changed its shape from small beaker to bigger one hence it does not have fixed shape.
Hope you got answer.thankyou

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According to Avogadro's Law, "Equal volumes of gases at the same temperature and pressure contain equal numbers of molecules". But how is this statement correct? How do we know that equal number of molecules are present in two gases taken in equal volumes?

Even if we consider equal volumes of any two gases(let's consider two gases for example) contain equal number of molecules, if we have the two gases in two containers of same volumes, we can add more gas to any one container and increase the density of the gas inside the container. In that case, the volume of the gas remains equal to the volume of the container but the number of gas molecules inside the container has increased and there is no chage to the number of molecules of the other gas we took inside a similar container. So now we have equal volumes of two gases but we have increased the number of molecules of one gas so now how can we say that the equal volumes of these two gases contain equal number of molecules?

If we take equal number of molecules of two gases and contain one of the gas in a container of some volume and the other gas in a container of a different volume, we will have unequal volumes of two gases having equal number of particles.

So how is Avogadro's Law explained?

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