Which of the following best describes the purpose of the narrow capillary tube in a liquid-in-glass thermometer?

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Question

Which of the following best describes the purpose of the narrow capillary tube in a liquid-in-glass thermometer?

Accepted Answer

It increases the sensitivity by making the liquid rise more for a given expansion — A narrow bore capillary tube ensures that even a small increase in the volume of the liquid produces a large and easily observable movement up the tube, thus increasing sensitivity. The narrowness of the bore has no effect on the freezing point of the liquid. While a larger movement may aid readability, the primary purpose is sensitivity. Response time is mainly affected by the size of the bulb, not the bore width.

Answer

It reduces the response time by decreasing the volume of liquid

Answer

It allows the thermometer to be read from a greater distance

Answer

It increases the sensitivity by making the liquid rise more for a given expansion

Answer

It prevents the liquid from freezing at low temperatures

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