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Hot and cold breath, tilting dog heads and an infuriating itch

Hot and cold breath, tilting dog heads and an infuriating itch

Thursday 18th April 2019 9:05 am

Why shouldn’t we eat our own poo? Why do bruises change colour? And the lady who literally picked her brain

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@beakerstreetsci
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Water will change its density a little bit with temperature, but ethanol does it 3.7 times better – and the modern liquids in a Galileo Thermometer are better again. This liquid is inside a sealed container – to avoid the effects of the changing air pressure.
Inside the container are a bunch of hollow, weighted glass balls – each carefully calibrated to have a different density, and each with a brass tag indicating the temperature. The single ball that is floating freely indicates the temperature of the liquid.
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