Differentiate between the following:
Lower and upper fixed points of a thermometer.

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Solution

Lower fixed point
Upper fixed point
The lower fixed point, or ice point, is the temperature of pure melting ice at normal atmospheric pressure.
The upper fixed point, or steam point, is the temperature of pure boiling water at normal atmospheric pressure.
The lower fixed point on the Celsius scale is 0 degree
The upper fixed point on the Celsius scale is 100 degree

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Lower fixed point	Upper fixed point
The lower fixed point, or ice point, is the temperature of pure melting ice at normal atmospheric pressure.	The upper fixed point, or steam point, is the temperature of pure boiling water at normal atmospheric pressure.
The lower fixed point on the Celsius scale is 0 degree	The upper fixed point on the Celsius scale is 100 degree