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JAMB Physics 2007 Question 31

Question 31

Temperature and Thermometers

I. Use a liquid with a high melting point.
II. Use a liquid of high volume expansivity.
III. Use a capillary tube of large diameter.
Which of the above best describes how the sensitivity of a liquid-in-glass thermometer can be enhanced?

  1. A.II only
  2. B.II and III only
  3. C.I only
  4. D.I and III only
Show the answer and explanation

Answer: A (II only)

Explanation

A thermometer is more sensitive when the liquid expands a lot per degree (high expansivity) and the bore is narrow. A wide tube or a high melting point does not help.