Physics
Solids have definite shapes.This is because

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

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Physics
Superconductors are substances which

conduct electricity at low temperature
offer no resistance to the flow of electricity
conduct electricity at high temperatures
offer high resistance to the flow of current

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