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JAMB Physics 2007 Question 39

Question 39

Temperature and Thermometers

A clinical thermometer is different from other mercury in glass thermometers owing to

  1. A.its long stem.
  2. B.the constriction on its stem.
  3. C.its wide range of temperatures.
  4. D.the grade of mercury used in it.
Show the answer and explanation

Answer: B (the constriction on its stem.)

Explanation

The constriction (narrow kink) stops the mercury flowing back into the bulb, so the reading stays after the thermometer leaves the patient.