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#theneedforpurple — Public Fediverse posts

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  1. Steven @drstevenwooding ·

    Turns out infrared thermometers don't get the temperature of water right.
    Alerted to this when dying a shirt.
    IR thermometer said 85°C - while I wondered why the water was gently bubbling.
    Digging out a mercury thermometer revealed why - it was at simmering at 100°C.

    The shirt still seems to have dyed okay.

    Any physicist care to explain?