State three different materials that can be used to demonstrate Brownian motion.
Question 1 Report
State three different materials that can be used to demonstrate Brownian motion.
Answer Details
Materials that can demonstrate Brownian motion:
- Smoke particles suspended in air (in a smoke cell), viewed under a microscope.
- Pollen grains suspended in water.
- Fine dust or graphite particles suspended in water or air.
Note: a suspension of gamboge or sulphur particles in water is also acceptable. In each case the tiny visible particles are seen to move in continuous, random, zig-zag paths because they are bombarded unequally by the much smaller, fast-moving molecules of the surrounding fluid.
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