Question

A mercury thermometer has a column length of 20 mm at the ice point and 170 mm at the steam point. If the column length is 65 mm, what is the temperature?

Options

• 30 °C

• 35 °C

• 40 °C

• 30.33 °C

Answer 1

30 °C

Explanation:

Using the thermometric property formula:

T = 100 × \[\frac{P_T-P_1}{P_2-P_1}\]

T = 100 × \[\frac {65-20}{170-20}\] = 100 × \[\frac {45}{150}\] = 30° C