Question

Define pseudo solid and true solid....

Answer 1

I think pseudo solid is a type of semi-solid they not hard . But true solid are pure solid and are consisting of strong solid nature..
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Answer 2

'Pseudo' means 'false' and pseudo solid means they are not true solid in nature. Glass is not a truly solid, it is an amorphous solid which differ from true solid (crystalline) not only in physical but also in chemical properties. The glass molecule moves around in random motion to attain stability and due to this nature of the glass molecules, glass is often referred to as supercooled liquid whereas, in true solids such as sodium chloride (which is crystalline in nature), the molecules only vibrate in their mean position. Pseudo solid also have low melting points whereas true solid have a fixed melting point. Pseudo solid shows short-range order and are isotropic in nature whereas true solids show long-range order (a regular pattern which is repeated periodically throughout the substance) and are anisotropic (show different value in physical properties when observed from different angles) in nature. 

You must have observed that in the very old building, the thickness of the glass at the bottom is a bit broader, this arises because the glass molecules are continuously in random motion and due to the action of gravity they are pulled downward broadening the bottom.