On a note emitted from a mug while mixing instant coffee

Farrell, W. E. and McKenzie, D. P. and Parker, R. L. (1969) On a note emitted from a mug while mixing instant coffee. Proceedings of the Cambridge Philosophical Society, 65. pp. 365-367. ISSN 0068-6735 DOI https://doi.org/10.1017/S0305004100044303,

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Official URL: http://dx.doi.org/10.1017/S0305004100044303


We have recently observed a curious phenomenon, undoubtedly well known, while mixing instant coffee in a mug. If the bottom of the mug was tapped repeatedly with the spoon as the powder was stirred into the water, the note emitted could be heard to rise in pitch by over an octave. This rise occurred in a matter of seconds, about the same time as it took the mug to heat up. Further experimentation showed that almost any powder could produce the effect in cold or hot water, but water alone would not. Vigorous stirring did not seem essential. A full mug showed as pronounced an effect as a half-filled one.

Item Type: Article
Uncontrolled Keywords: NIL AREP
Subjects: 99 - Other
Divisions: 99 - Other
Journal or Publication Title: Proceedings of the Cambridge Philosophical Society
Volume: 65
Page Range: pp. 365-367
Identification Number: https://doi.org/10.1017/S0305004100044303,
Depositing User: Sarah Humbert
Date Deposited: 21 May 2015 10:27
Last Modified: 21 May 2015 10:30
URI: http://eprints.esc.cam.ac.uk/id/eprint/3298

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