Crushing a can by heating it, sealing it and cooling it rapidly is an excellent demonstration of the existance of atmospheric pressure. Many youtube videos describe the crushed can as an illustration of either Charles' Law or Gay-Lussac's Law. I don't agree.
In the electromagnetic spectrum illustration and light color, frequency and wavelength post, I needed to calculate color from wavelength value. I tried a few different approaches but finally settled on a modified version of some widely cited FORTRAN code for determining RGB values.
Beginning work on an illustration covering the relationship between the frequency
The JavaScript canvas element does not have a native method for drawing ovals (ellipses).
UPDATE: Final illustration posted - Lunar and Solar Tides
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