Colloid is the states and conditions of a mixture when the dispersed substance in the solvent media lies between 10 Amstrong to 2000 Amstrong in diameter. The particles or substance of such sizes is also called colloidal state. On the basis of the size of the dispersed media colloid is to define as the middle state between true solution and suspension. In a true solution the diameter of the dispersed substance is between 1 Amstrong to 10 Amstrong. But in suspension the diameter of the dispersed substance is more than 2000 Amstrong. First Thomas Graham studied the behaviour of diffusable substance. He found that some substance are diffusible in the solvent through permeable membrane and other are not. He called first as crystalloid and others are colloid. On the basis of dispersed particle and dispersion media there found eight types of colloid. The particles that distributed in a colloidal solution is called dispersed phase and where the particles are dispersed is called disperaion media. If the dispersed phase is solid and the dispersion media is liquid then it is called sol. If the dispersed phase dispersed into water then the colloid is Call d Hydrosol. If liquid is dispersed into liquuid then colloid is called emulsion. The liquid if dispersed onto gas, the colloid is called aerosol.
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