Skip to content Home Physics What are the functions of a clinical thermometer? Ben Davis January 25, What are the functions of a clinical thermometer? Who am I I am found in a thermometer I measure your temperature? Who I am I am useful for measuring the correct temperature?
What is the working principle of clinical thermometer? How does the constriction near the bulb in a clinical thermometer help in measuring body temperature accurately? What precautions should be taken while using a laboratory thermometer and clinical thermometer? Which metal is used in clinical thermometer? What is clinical thermometer explain with diagram? What is the difference between a clinical thermometer and a laboratory thermometer? What are the types of clinical thermometer?
What are the three differences between clinical and laboratory thermometer? What is the range of clinical thermometer? What are the limitation of clinical thermometer? Solutions :. These are cleaned before and after each use, with alcohol. Related Doubts State the difference between a clinical thermometer and a laboratory thermometer? Asked on 23rd Jul, View More. Referral Program Distribute the referral code to your friends and ask them to register with Tutorix using this referral code.
Your subscribed friend will also get 1 month subscription absolutely free. Ask Your Doubts We are really eager to clarify your doubts. Disadvantage: Mercury is poisonous in nature. In case, the glass bulb breaks while taking the temperature, mercury can leak into the mouth.
That is why electronic digital thermometers and scanner thermometers have gradually replaced the mercury thermometers. Note the temperature difference between two bigger marks on the scale of the thermometer. If there are 10 divisions between the two consecutive bigger marks, then one smaller division will be equal to 0. The thermometer is to be placed under the tongue inside the mouth of the patient to obtain the temperature of the body. When the reading is taken, the thermometer needs to be held vertical to the eyes and the eyes must be at level with the top of the mercury in the capillary thread.
Laboratory thermometers cannot be used for clinical purposes because such thermometers read temperatures ranging from oC to oC, which is very high as compared to the human body temperature range.
The basic laboratory thermometer is similar to the clinical thermometer except that the laboratory thermometer does not have any kink. Due to the absence of the kink, these laboratory thermometers are used in a continuous process and need to be monitored all the time to get accurate results. Moreover, the size of the laboratory thermometer is larger as it measures a wide range of temperatures.
Also, these thermometers have a high resolution. The normal temperature in a clinical thermometer is from about 35 degrees to 42 degrees. The temperature of a healthy human body is approximately To determine the temperature a person has to hold the tip of the thermometer either under the armpit or in the mouth under his tongue for a minute.
Then we monitor the number against the point at which the mercury line stop growing further indicates the body temperature of the person. Working Principle: The thermometer is thoroughly shaken before measuring the temperature of the body. Then the mercury level drops and remains inside the bulb. In this condition, if the thermometer is placed under the tongue or under the arms, the temperature and consequently the volume of the thermometer increases.
As a result, some mercury flows through the capillary tube C from the bulb B. When the thermometer is taken out of the body, the mercury level contracts. Consequently, the mercury above level C goes back to the bulb. But since the mercury level above C cannot come back to the bulb through the fine capillary tube, it remains above C. So the upper level of the mercury surface indicates the temperature of the body.
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