Physics
Outside of cooking utensils are generally left black from below because

Black surface is a good conductor of heat.
Black surface is a good absorber of heat.
It is difficult to clean daily.
Black surface is a poor conductor of heat.

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Physics
Solids have definite shapes.This is because

The forces of adhesion are less
The forces of adhesion are large
The forces of cohesion of the molecules within are very much less in them
The forces of cohesion are very large

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