Why is my cup of coffee adopt a step increase when mixed / tapped with a spoon, a full-time?

Years ago, I noticed that when I filled my coffee cup ceramic coffee with hot water and shake, the height of the sound given off by scraping or tapping the spoon against the cup rises from a minimum step by step with increased every tap. Try it, take a cup, fill with boiling water and begin gently tapping the bottom of the cup with a metal spoon, listen as the tone is growing steadily every touch ...

When the first coffee is poured into ceramic molecules are further beyond, because things are restrict cold (just ask George Costanza), resulting in more space between molucules and the creation of a lesser height, but as the coffee cup heats expand molecules, reducing the distance between each molecule and the increase of the field.

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