The random movement of pollen grains in a suspension as seen through a microscope is shown. The motion is due to the random motion of millions of atoms or molecules on relatively large particles (now called Brownian motion). This is followed by a mechanical analogy using pucks on an air-table showing the underlying reason for the random motion of the particles.
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Duration: 00:02:28
Keyword(s): States of matter, Brownian motion, Robert Brown, molecules.
Contributor(s): Professor Gerald Elliott
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Footage description: B/W. Elliott speaking in the studio directly to camera. Film of pollen grain suspension viewed through a microscope with voice over from Elliott. Elliott standing next to an air table speaking to camera. He switches it on. Voice over from Elliott. A white puck is filmed moving on the table in semi darkness. Illumination is increased to reveal black pucks moving on the table alongside the white puck. Film of pollen grain suspension viewed through a microscope.
Master programe code and title: S100/05 Science course unit 5
Master programme recording date: 06/02/1972
Master programme first presentation: 1971
Master programe filename: S100_1971X_BX_V005.avi
Master programme production number: JOUZ360J
Available to public: yes