Dip the laboratory thermometer in the water so that its bulb gets completely immersed in it, but make sure the bulb doesn’t touch the bottom of the beaker. We wear woollen clothes during winters when it is cold outside. Plastic strip thermometers for the mouth are also available. Let us learn how to read a thermometer. It is made of a thin glass tube sealed at one end and a bulb with mercury at the other end. One should be careful while reading temperatures between 100 degrees and 101 degrees, because many people mistakenly record or report the tenth of a degree as a whole degree. The temperature of human body normally does not go below 35oC or above 42oC . A clinical thermometer reads temperature from 35 oC to 42 oC. Clinical thermometer is used to measure our body temperature. In this chapter we shall try to seek answers to some of these questions. In summer, you feel hot even inside the house. No-contact thermometers are popular among pediatricians, as kids often squirm around when trying to get a temperature read, but it also holds true in mass temperature screenings. Can you then use the laboratory thermometer to measure your body temperature? Laboratory thermometers are designed for lab purposes such as checking boiling point, freezing point, or temperature of other substances. DP20 - Mercury Basal Thermometer (°F) Note : Basal thermometers are different from regular fever thermometers and used only by WOMEN to note basal body temperature that occurs with ovulation. (i) It is proportional to average kinetic energy of the molecules of the body. The temperature of every person may not be 37 oC. Mix some cold and hot water in mug C. Now dip your left hand in mug A and the right hand in mug B. The clinical thermometer is designed to measure the temperature of human body only. It has a bulb at one end. Some of them are hot and some of them are cold. Why does the mercury not fall or rise in a clinical thermometer when taken out of the mouth? Change in state of matter: On heating, most of the substances change its state, like solid to liquid, liquid to gas, etc. We prefer to wear light coloured cotton clothes when it is hot. Suppose the bigger marks read one degree and there are five divisions between them. 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(i) It is total amount of internal energy of the molecules of a body. Most electronic thermometers have a digital display that shows you the temperature reading. A clinical thermometer reads temperature from 35 C to 42 C. (ii) Laboratory thermometer: This type of thermometer is used to measure the temperature of different objects in laboratories. Expansion due to heat is known as thermal expansion. We see that some objects are cold while some are hot. This is the temperature of water at that time. Wash the thermometer, preferably with an antiseptic solution. It could be slightly higher or slightly lower. For this purpose, there are other thermometers. Take three large mugs. The tip of the thermometer is inserted into the mouth under the tongue ( oral or sub-lingual temperature ), under the armpit ( axillary temperature ), into the rectum via the anus ( rectal temperature ), into the ear ( tympanic temperature ), or on the forehead ( temporal temperature ). Hold the thermometer vertically (Fig. Clinical thermometers may have an analogue or a digital display and cover a short range of temperature around 37 C. Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005 Recall that when you or someone else in your family had fever, the temperature was measured by a thermometer. A thermometer looks like the one shown in the above figure. The thermometer that measures our body temperature is called a clinical thermometer. Ensure that before use the mercury level is below 35°C. A medical thermometer (also called clinical thermometer) is used for measuring human or animal body temperature. Woollen clothes keep us warm. So heat causes combustion. The range of this thermometer is from 35, The normal temperature of the human body is 37. Actually, what we call normal temperature is the average body temperature of a large number of healthy persons.