Unit 2 Brownian Motion
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What causes random movement of particles?
Irregular bombardment of the particles by fast-moving invisible, air molecules
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What is Brownian Motion evidence for?
The existence of atoms of gases
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Who first observed brownian motion?
Robert Brown
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Are air particles visible?
The atoms are too small to be seen with visible light, even with the best microscope.
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Are air particles small compared to smoke particles?
Yes, they are very small indeed. About 1 millionth of a millimetre across.
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Are air particles fast?
They move fast
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How do air particles move?
Randomly.
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