Physics
Water is not suitable as a calorimetric substance because it :

Low latent heat of vapourization
Has high boiling point
Is a good conductor
Has high specific heat

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Physics
Solids have definite shapes.This is because

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

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