NCERT CLASS IX - Science Textbook
Chapter 1 - Matter in Our Surroundings
Give reasons:
(a) A gas fills completely the vessel in which it is kept.
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Particles in a gas called molecules, are free to move in all directions. They move at very high speeds. They have very little attraction forces among themselves.
These molecules have tendency to randomly move everywhere. The property that a gas occupies all space available to it is called diffusion. Thus any gas occupies the entire volume of the container in which it is present.
The gas molecules are reflected from the walls of the container.
These molecules have tendency to randomly move everywhere. The property that a gas occupies all space available to it is called diffusion. Thus any gas occupies the entire volume of the container in which it is present.
The gas molecules are reflected from the walls of the container.
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The particles of a gas have high kinetic energy and they move in all possible directions independent of each other because there exist practically no forces of attraction between them.
So , that is why a gas fills completely The vessel in which it is kept.
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