Physics
When a bottle of perfume is opened in one corner of a room the smell spreads soon throughout the room. This is an example of

Diffusion
Viscosity
Surface tension
Capillarity

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Physics
For an ideal gas, which one of the following statements does not hold true?

The speed of all gas molecules is same
The kinetic energies of all gas molecules are not same
The potential energy of the gas molecules is zero
There is no interactive force between the molecules.

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