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Celsius Scale

On the Celsiu...

Question

On the Celsius scale the absolute zero of temperature is at

A

0°C

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B

- 32°C

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C

100°C

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D

- 273.15°C

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Solution

The correct option is D
- 273.15°C

T = 273.15 + $t^{\circ}$ C $\Rightarrow 0 = 273.15 + t^{\circ} C \Rightarrow t = - {273.15}^{\circ} C$

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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

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(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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