fixed point... thz

我唔明

lower fixed point

--This is the temperature of pure melting ice at normal atmospheric pressure.

同埋

upper fixed point

--This is the temperature of the steam over pure boiling water at normal atmospheric pressure.

點解??

1 Answer

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  • 1 decade ago
    Best Answer

    Because we often use water to do the measure of heat.

    So we use the temperature of pure melting ice as the lower fixed point and the temperature of the steam over pure boiling water as upper fixed point.

    At normal atmospheric pressure means that in the Earth and not the space,moon or etc.

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