Dry Ice

Dry Ice
Dry ice, sometimes referred to as “Cardice” or as “card ice” is the solid form of carbon dioxide. Dry ice is used as a cooling agent. Dry ice is the solid form of carbon dioxide (chemical formula: CO2), comprising two oxygen atoms bonded to a single carbon atom. It is colourless, odourless, non-flammable, and slightly acidic.
Sublimation and Deposition
Many materials have clear  Triple changing points Gas, Liquid, and Solid by the temperature and pressure. Is usually most substance molecules by heat and pressure vibration and begin, but it is not be a molecular position change. And next  liquid state begins to gravitas (melting point), while molecules together sticks and begins to move freely.  And further increase highpressure or temperature, Molecules are completely apart and popping in the air, Most people  anyone know it. However,because of   the nature of the substance  under  the temperature where we lived at room suddenly become  gas individual phenomenon is seen, such as carbon dioxide. Solid state is Christmas cake that come with dry ice.
    CO2 changes from a solid to a gas with no intervening liquid form, through a process called sublimation. The opposite process is called deposition, where CO2 changes from the gas to solid phase (dry ice). Actuary at temperatures above −56.4 °C (−69.5 °F) and pressures below 5.2 bar, we can watch this phenomenon, and under the conditions more high temperature and pressure 3 steps apears including liquid. However, the liquid is seen in our everyday lives.
 It is generally accepted that dry ice was first observed in 1834 by French chemist Charles Thilorier, In 1925, this solid form of CO2 was trademarked by the DryIce Corporation of America as “Dry ice”, thus leading to its common name. Carbon dioxide-rich gas is pressurized and refrigerated and commercialization.
Molecular Join
 Often this relation of the molecule is very weak for mostly changable alternative easily to liquid or gas in the low-temperature of 100 degrees or less, but  the ion binding has a strong relation is haunting and needs  high temperature to separate itselves.  For example, NaCl  is seen liquefied phenomenon at 800 Degrees.


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