Physics
A gas thermometer is more sensitive than a liquid thermometer because a gas :

Does not change state easily
Is easy to obtain
Is lighter than liquid
Expands more than a liquid

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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
A drop of liquid assumes spherical shape because:

Inter molecular forces are weak in liquids
A sphere has the least surface area for a given volume
A sphere has the largest surface area for a given volume
Intermolecular forces are strong in liquids

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