Analysing Technical Interrelationships - Example 5

If the temperature is increased by x degrees, the liquid inside each thermometer expands by the same volume. However, this increase in liquid volume makes the liquid rise to a higher level in the tube of the thermometer on the left. Since the cross-section of the tube in the left-hand thermometer is smaller than that of the right-hand one, a defined temperature change generally leads here to a greater change in the liquid level than with the right-hand thermometer. Consequently, temperature changes can be measured more accurately with the left-hand thermometer than with the right-hand one. Statement I is therefore false.

Since a rise in temperature has a lesser effect on the liquid level in the tube of the right-hand thermometer than on that in the left-hand one, greater changes in temperature can be measured with the right-hand thermometer. The right-hand thermometer thus covers a larger temperature range. Statement II is therefore correct.