give reason of a clinical thermometer
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(d) 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.
(e) It has a pear shaped cross-section which acts as a magnifying glass in one direction and magnifies the narrow thread of mercury making it easy to read.
(f) Because you will break it. The clinical thermometer has been made to measure temperature around our physiological temperature or 95 to 105F (35 to 40C.Using it in boiling water would break it, going way past the max temperature for this thermometer.
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