Definition of Gases

A gas has neither any shape nor any definite volume, It takes the shape of the container and occupies the whole space available.

Example of Gases: If we open a bottle of perfume, the aroma fills the whole room. If we open the door, the aroma fills the next room also.

More About Gases:

  • According to kinetic theory, a gas has molecules at a very large distance from each other, very much larger than in solids and liquids. So the intermolecular force of attraction diminishes to almost zero.
  • The motion of gas molecules is rapid. In a gas the molecules move about freely and occupy whatever space is available.
  • A gas has no shape or volume of its own.
  • In a gas there is plenty of empty space between molecules, therefore gas can be easily compressed.

Definition of Gases

Gases Worked Examples:

Which of the following character describes a gas?

    A. Particles move about freely at high speed.
    B. Fixed shape and volume
    C. Particles vibrate and cannot change positions
    D. Particles vibrate but can change positions.
    Correct answer is A


    Step 1:In gases particles move about freely at high speed.
    Step 2: Only solids will have fixed shape and volume.
    Step 3: In solids particles vibrate and cannot change positions.
    Step 4: In liquids particles can vibrate but can change positions..

    Related terms: Solids | Liquids | Molecules.
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