Question

A constant volume gas thermometer shows pressure reading of 50cm and 90cm of mercury at 0°C and 100°C respectively. When the pressure reading is 60 cm of mercury, the temperature is

• A. 25°C
• B. 40°C
• C. 15°C
• D. 12.5°C

Answer 1

Answer: (A)

25°C

Answer 2

$t = \frac{(P_{t} - P_{0})}{(P_{100} - P_{0})} \times 100{^\circ}C = \frac{(60 - 50)}{(90 - 50)} \times 100 = 25{^\circ}C$