Question

(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?

(b) There were two fixed points in the original Celsius scale i.e. 0°C and 100°C. On the absolute scale one of the fixed point is the triple point of water. What is the other fixed point on Kelvin scale?

(c) Absolute temperature and temperature on Celsius scale are related as

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Why do we have 273.15 in the relation and not the 273.16?

Solution

(a) The triple point of water is a unique temperature and does not change with pressure.
The melting point and boiling point of water vary with pressure.
That is, there is no fixed melting and boiling point of water.

(b) The second fixed point on the absolute scale is zero on the absolute scale.

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Mechanical Properties Of Fluids

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