Does a Clinical Thermometer Have a Large Bore?

The clinical thermometer is a small tubular instrument of rather thick glass. ... It consists essentially of a small vacuum tube of uniform bore closed at one end and connected at the other with a mercury chamber (either a bulb or a short tube of larger bore).

Why does a clinical thermometer have a narrow bore?

In a mercury thermometer, it prevents the mercury from dropping immediately back into the bulb when the thermometer is removed from the patient. That constriction may or may not be present in an alcohol thermometer.

Does a clinical thermometer have a wide or narrow bore?

The thermometer is made relatively small so that it is portable and cheap. The liquid is contained in a thin-walled glass bulb. The bulb is made relatively larger than its bore to contain more of the liquid, so as to improve sensitivity. The narrow bore of the capillary tube is uniform.