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Elevation in Boiling Point

In the Celsiu...

Question

In the Celsius scale, the upper fixed point is:

A

Melting point of ice

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B

Boiling point of water

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C

Boiling point of mercury

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D

Mean of melting point and boiling point of water

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Solution

The correct option is B Boiling point of water
The upper fixed point in the Celsius scale is $100^{0} C$ , which is the boiling point of water.

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Q. Answer the following : (a) The triple-point of water is a standard fixed point in modern thermometry. Why ? What is wrong in taking the melting point of ice and the boiling point of water as standard fixed points (as was originally done in the Celsius scale) ? (b) There were two fixed points in the original Celsius scale as mentioned above which were assigned the number 0 °C and 100 °C respectively. On the absolute scale, one of the fixed points is the triple-point of water, which on the Kelvin absolute scale is assigned the number 273.16 K. What is the other fixed point on this (Kelvin) scale ? (c) The absolute temperature (Kelvin scale) T is related to the temperature tc on the Celsius scale by t_c = T – 273.15 Why do we have 273.15 in this relation, and not 273.16 ? (d) What is the temperature of the triple-point of water on an absolute scale whose unit interval size is equal to that of the Fahrenheit scale ?

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