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
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
at the top of Mt. Everest
at sea level
at a place in a valley below sea level

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

cohesion of mercury is greater than its adhesion with glass.
cohesion of water is greater than its adhesion with glass.
mercury is a metal.
density of mercury is greater than that of water.

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