10.3 Characteristic properties of Gases :
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gases do not have definite Shape and not definite volume.
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Gases have three characteristic properties:
(1) they are easy to compress.
(2) they expand to fill their containers.
(3) they occupy far more space than the liquids or solids from which they form.
Compressibility
An internal combustion engine provides a good example of the ease with which gases can be compressed. In a typical four-stroke engine, the piston is first pulled out of the cylinder to create a partial vacuum, which draws a mixture of gasoline vapor and air into the cylinder (see figure below). The piston is then pushed into the cylinder, compressing the gasoline/air mixture to a fraction of its original volume.
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