3). A clinical thermometer reads temperature from 35 oC to 42 oC. It has a bulb at one end. It should be read keeping the level of mercury along the line of sight (Fig. How do we measure the temperature of other objects? (i) It is total amount of internal energy of the molecules of a body. Combustion: On heating, some of the substance reach their ignition temperature and starts burning. Do you see a kink near the bulb (Fig-4). In summer, you feel hot even inside the house. How do we know whether an object is hot or cold? Obviously, it is not convenient to use the laboratory thermometer for this purpose. Can you then use the laboratory thermometer to measure your body temperature? Hold the thermometer vertically (Fig. Read the thermometer keeping the level of mercury along the line of sight. Dip the thermometer in water so that the bulb is immersed in water but does not touch the bottom or the sides of the container. Observe a clinical thermometer again. Temperature is a measure of the degree of hotness of an object. You would need this information to read the thermometer correctly. Keeping the container near the gas stove while cooking. All Rights Reserved. How to Measure Body Temperature by Thermometer Best thermometer … Thermometer is a device used for measuring temperatures. You also know that cotton clothes are made from plant fibres. Note the reading. 3 color display temperature … This is the temperature of water at that time. We see that some objects are cold while some are hot. If you do not have a thermometer, request a friend to share it with you. It could be slightly higher or slightly lower. A thermometer looks like the one shown in the above figure. A clinical thermometer consists of a long, narrow, uniform glass tube. Activity 4.2 Reading a thermometer Let us learn how to read a thermometer. NET Basal Mercury Thermometer is an accurate device to chart basal body temperature … A clinical thermometer reads temperature from 35°C to 42°C. Most of the mercury thermometer, though, have dual scales. Temperature is measured by a device called thermometer. Take three large mugs. Clinical thermometer is used to measure our body temperature. We wear woollen clothes during winters when it is cold outside. Outside the bulb, a small shining thread of mercury can be seen. After one minute, take the thermometer out and note the reading. The scale we use is the Celsius scale, indicated by oC. Electronic ear thermometers are common. These give us a feeling of coolness. Why does the mercury not fall or rise in a clinical thermometer when taken out of the mouth? If you do not see the mercury thread, rotate the thermometer a bit till you see it. Observe the movement of mercury in the thermometer. This is your body temperature. Then, how do we find out how hot an object really is? We prefer to wear light coloured cotton clothes when it is hot. Recall that when you or someone else in your family had fever, the temperature was measured by a thermometer. Wash the thermometer, preferably with an antiseptic solution. Laboratory thermometers are designed for lab purposes such as checking boiling point, freezing point, or temperature of other substances. (ii) As a result of heat exchange between two bodies, sum of their temperature before and after exchange is not same. Take some tap water in a beaker or a mug. The temperature of every person may not be 37 oC. List some objects you use commonly in Table-1. These thermometers can be used on the forehead, mouth, armpit or rectum. 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. The temperature of human body normally does not go below 35oC or above 42oC . Actually, what we call normal temperature is the average body temperature of a large number of healthy persons. Do both the hands get the same feeling?

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