Q:

Why will the metal bell of a stethoscope that is at the room’s air temperature, produce the sensation of cold when placed on the patient’s skin?

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Why will the metal bell of a stethoscope that is at the room’s air temperature, produce the sensation of cold when placed on the patient’s skin?


  1. The skin is at a lower temperature than the bell.
  2. The stethoscope bell is a good conductor of heat.
  3. The stethoscope bell is a poor conductor of heat.
  4. Sweat evaporating from under the bell cools the skin.

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B: Being a good conductor of heat, the metal bell will gain heat from the skin until all its mass reaches skin temperature. A non- conductor would only gain heat until the surface in contact reached skin temperature. 

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