Process Operation Technology

I invite you to join Process Operation Technology website

You can find everything about industry area
Your Engineering Reference
Your Guide in your Career

You can find new news about Process Operation Technology
You can find all famous magazines
You can find all New updated programs

With Operation Technology website, You're on the right way
Process Operation Technology

Oil, gas and petrochemical process industries

    States of Matter

    Talib Al_Munawri
    Talib Al_Munawri

    Posts : 337
    Join date : 2009-07-03
    Age : 32
    Location : Sultanate of Oman

    States of Matter Empty States of Matter

    Post by Talib Al_Munawri on Fri Sep 11, 2009 10:00 pm

    States of Matter

    [You must be registered and logged in to see this link.]


    Solids are rigid, they maintain their own shape; their shape is not influenced by the shape of their containers; they have a fixed volume and a fixed shape. Powders are solids too. Even though the powdered material as a whole doesn't retain its shape, the individual particles do.

    The intermolecular forces between neighboring molecules are strong enough to keep them locked in position

    Solids (like liquids) are not very compressible due to the lack of space between molecules.

    If the molecules in a solid adopt a highly ordered packing arrangement, the structures are said to be crystalline
    Due to the strong intermolecular forces between neighboring molecules, solids are rigid.


    Liquids, on the other hand, are not rigid. They are fluid. Their shape adapts to fit the bottom of whatever container they are in. The top surface of a liquid is approximately flat and level. Their volume is fixed but their shape is not.

    Liquids have a definite volume, independent of the size and shape of their container

    The attractive forces are not strong enough, to keep neighboring molecules in a fixed position

    Molecules are free to move past or slide over one another
    Thus, liquids can be poured and assume the shape of their containers

    Gases :

    Gases are not rigid. Their shape is not fixed. Also, their volume is not fixed. The volume occupied by a gas is not determined simply by the amount of gas that is present. Any gas, by itself or mixed with others, will spread out completely fill whatever container it is in, because if the gas is put into a container having a hole, the gas will spread beyond the walls of the container.

    The kinetic energy of the molecules is greater than attractive forces between the molecules.

    The lack of any significant attractive force between molecules allows a gas to expand to fill its container.

    If attractive forces become large enough, then the gases exhibit non-ideal behavior.

    Gases have weaker intermolecular forces than liquids and liquids have weaker intermolecular forces than solids.

      Current date/time is Tue Jul 23, 2019 10:51 am