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Important Characteristics of Gases

  • 1)

    Gases are highly compressible An external force compresses the gas sample and decreases its volume, removing the external force allows the gas volume to increase.

  • 2)

    Gases are thermally expandable When a gas sample is heated, its volume increases, and when it is cooled its volume decreases.

  • 3)

    Gases have low viscosity Gases flow much easier than liquids or solids.

  • 4)

    Most Gases have low densities Gas densities are on the order of grams per liter whereas liquids and solids are grams per cubic cm, 1000 times greater.

  • 5)

    Gases are infinitely miscible Gases mix in any proportion such as in air, a mixture of many gases.

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