Quote:
a few drops of dishwashing stuff (swiftech states that to be good to decrease water surface tension)
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Washing up liquid
is a 'Surfactant', but it
Increases surface tension to the point that (strong!)bubbles can form!!...
AFAIK Mercury(when it expands) in a thermometre pushes
red dye up the tube, so yes, they are 'little red temp gauges'

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