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Question

If a perfume bottle is opened at one end of a room, the odor will quickly be detected on the other side of the room. Why?
  1. The molecules are diffusing.
  2. The molecules are being compressed.
  3. Your sense of smell improves.
  4. The molecules are condensing.

A
Your sense of smell improves.
B
The molecules are being compressed.
C
The molecules are condensing.
D
The molecules are diffusing.
Solution
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Diffusion is a consequence of the constant motion of atoms, molecules and particles of gases. Perfumes are made up of by volatile gases, which diffuse fastly in air, as the bottle is opened and its smell quickly reaches on other side of room.

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