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Generally two fixes points,Tof pure melting ice and T of steam of water boiling at one atomospheric pressure.are needed to build a standard degree of coldness and hotness. So that there will be a range of T to set the scale.

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11y ago
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12y ago

The two fixed points will be known temperatures, the assumption is that temperature varies linearly between these two points therefore you can mark out the scale

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Q: Why fixed points are needed before a temperature scale is marked on a thermometer?
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