we open a perfume bottle in a closed room or than the perfume smell is spread in the whole room. how is this possible??
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it's bcz of dispersion of gas...
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When chemical substances such as perfume are let loose in a room, their particles mix with the particles of air. The particles of smelly gas are free to move quickly in all directions. They eventually spread through the whole room from an area of high concentration to an area of low concentration.
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