Thermal Properties of Matter NCERT Solutions Class 11 Physics - Solved Exercise Question 11.1

Question 11.1:
The triple points of neon and carbon dioxide are 24.57 K and 216.55 K respectively. Express these temperatures on the Celsius and Fahrenheit scales.
Solution:
Kelvin and Celsius scales are related as:
TC = TK – 273.15 … (i)
Celsius and Fahrenheit scales are related as:
TF = (9/5) TC + 32    ...(ii)

For neon:
TK = 24.57 K
TC = 24.57 – 273.15 = –248.58°C
TF = (9/5) TC + 32
= (9/5) (-248.58) + 32
= 415.44o F

For carbon dioxide:
TK = 216.55 K
TC= 216.55 – 273.15 = –56.60°C
TF = (9/5) TC + 32
= (9/5) (-56.6) + 32
= -69.88o C

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