Abstract
The simple coffee mug can be used to illustrate many important concepts in acoustics. Adding water to the mug shows the effect of mass on the frequency of oscillation. Striking on the handle of the mug compared to striking the side of the mug shows the vibrational mode degeneracy lifting. Adding instant coffee or hot chocolate mix to a mug full of water heated in a microwave oven shows the effect of bubble density on the speed of sound. Each of these concepts are easily demonstrated and can also be used as starting points for student exploration in the laboratory.
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