1.

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

Answer»

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




tc
= 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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