Molecules in motion - Eric M. Rogers' 1979 Christmas Lectures 2/6
Eric Rogers discusses the movement of molecules and atoms using experiments in his second Christmas Lecture.Watch all the lectures in this series here: https://youtube.com/playlist?list=PLbnrZHfNEDZzOq1zfje2o8Y_nIrHmdtbX&si=Q6s4EbX1BAGz-KlO
Watch our newest Christmas lectures here: https://www.youtube.com/playlist?list=PLbnrZHfNEDZyQJZLPMjwEoOLdkFBLU2m1
This was recorded on 2 Dec 1979.
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This year marks 200 years of the Royal Institution Christmas Lectures — a world famous series showcasing science, curiosity, and mind-blowing demos, and started by the legendary Michael Faraday himself.
To celebrate, we're unlocking the archive. Every Saturday, we’ll upload a classic lecture to our YouTube channel — some not seen since they aired on TV. Sign up as a Science Supporter and get early access here:
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From the 1979 programme notes:
How does air exert its pressure? What does that pressure suggest concerning air molecules? See the effect of air molecules bombarding tiny visible victims. We shall measure the spacing of molecules in air; also estimate their speed. See liquid air and argue some evidence from it. How does jet propulsion work? Hot exhaust gases blast out backwards as their molecules rebound from internal walls which they push forwards.
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About the 1979 CHRISTMAS LECTURES
Except for clever suggestions, our knowledge of atoms is very young compared with our older scientific knowledge. Some of it is a few centuries old but much of it is only one century old at most. There are two reasons for that late development. First: since atoms are (as we now know) far too small to be seen, all our experimental gathering of knowledge has to be indirect. Although we now know a great deal about atoms, and about the still smaller parts of atoms, we still have to describe them by imaginative pictures which we call models.
Second: even to build such knowledge indirectly, new apparatus had to be developed, such as vacuum pumps and electronic supplies for high voltage. The aid of a vast new technology was needed.
Nowadays when one learns what has been discovered about atoms one has to learn by hearsay, one has to accept the indirect methods and swallow the picturing by imaginative models. Then a keen listener must long for some experimental support or illustrations. That is what these lectures will offer in their 'circus of experiments'. The circus cannot cover all our new knowledge of atoms but it will, we trust, give visitors a feeling of friendly first-hand acquaintance, a contribution of confidence and understanding as well as a delight in seeing experiments.
Find out more about the CHRISTMAS LECTURES here: https://www.rigb.org/christmas-lectures
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