The colloidal state of matter was first introduced by Thomas Graham in 1861. He divided substances into two classes, depending on the ability of diffusion.
Colloids are the substances which can not diffuse through colloidal membrane or parchment membrane e.g. starch, gelatine etc. if the particles of sugar are dissolved in water, a homogeneous solution (true solution) is obtained. The particles in true solution are too small (10-9 m) to be seen with naked eye or even under microscope.
On the other hand if a little clay or sand is mixed with water, a heterogeneous mixture (suspension) is obtained. The particles in suspension are so large (10-7 m) that they are visible even to the naked eye.
The particles in colloidal state possess the size between that of particle in true solution and particle in suspension.
In other words the size of the colloidal particles lies between 10-9 m and 10-7 m.
The colloidal particles form the dispersed phase, the medium used for dispersion is called dispersion medium.
A dispersed phase & dispersion medium together form a colloidal system.
The dispersed phase and dispersion medium may be solid, liquid or gaseous.
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Don’t want your columns to simply stack in some grid tiers? Use a combination of different classes for each tier as needed. See the example below for a better idea of how it all works.
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For grids that are the same from the smallest of devices to the largest, use the .col and .col-* classes. Specify a numbered class when you need a particularly sized column; otherwise, feel free to stick to
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