5.4 Compressibility | Mobility | Density of Gases | Class 9th | Chemistry | Chap 5

Compressibility
Gases are highly compressible due to empty spaces between their molecules. When gases are compressed, the molecules come closer to one another and occupy less volume as compared to the volume in uncompressed state.

Mobility
Gas molecules are always in state of continuous motion. They can move from one place to another because gas molecules possess very high kinetic energy. They move through empty spaces that are available for the molecules to move freely. This mobility or random motion results in mixing up of gas molecules to produce a homogeneous mixture.

Density of Gases
Gases have low density than liquids and solids. It is due to light mass and more volume occupied by the gas molecules. Gas density is expressed in grams per dm-3 Whereas, liquid and solid densities are expressed in grams per cm' i.e. liquids and solids are 1000 times denser than gases. The density of gases increases by cooling because their volume decreases. For example, at normal atmospheric pressure, the density of oxygen gas is 1.4 g dm-3 at 20°Cand 1.5 g dm-3 at0°C.

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Video Chapters
0:00 Intro
1:05 Compressibility of Gases
3:57 Mobility of Gases
8:26 Density of Gases