It should be washed before and after use, preferably with an antiseptic solution. (i) It is total amount of internal energy of the molecules of a body. Take three large mugs. (ii) As a result of heat exchange between two bodies, sum of their temperature before and after exchange is not same. Recall that when you or someone else in your family had fever, the temperature was measured by a thermometer. The range of a laboratory thermometer is generally from - 20oC (Fig-3). Woollen clothes keep us warm. The scale we use is the Celsius scale, indicated by o C. A clinical thermometer reads temperature from 35 o C to 42 o C. NET Basal Mercury Thermometer is an accurate device to chart basal body temperature … Look at it carefully and note the highest and the lowest temperature it can measure. Note the reading. Change in state of matter: On heating, most of the substances change its state, like solid to liquid, liquid to gas, etc. Rise in temperature: When a body absorbs heat, it gains energy. Read it after 1 minute while the strip is in place. This bulb contains mercury. We had learnt that woollen clothes are made from animal fibres. Then, how do we find out how hot an object really is? Activity 4.2 Reading a thermometer Let us learn how to read a thermometer. You will also find a scale on the thermometer. Let us find out. Let us now learn how this thermometer is used. Temperature is a measure of the degree of hotness of an object. Observe a clinical thermometer again. After keeping the hands in the two mugs for 2 minutes, dip the hands simultaneously in mug C . 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 Tea is hot and ice is cold. Plastic strip thermometers for the mouth are also available. In our day-to-day life, we come across a number of objects. You may recall that while taking your own temperature, you have to take the thermometer out of your mouth to note the reading. We prefer to wear light coloured cotton clothes when it is hot. That is the reason that this thermometer has the range 35oC to 42oC. (ii) As a result of heat exchange between two bodies, total amount of heat of two bodies remains unchanged. Now place the bulb of the thermometer under your tongue. Electronic ear thermometers are common. They are easy to use. It should not be held by the bulb while reading. If you do not see the mercury thread, rotate the thermometer a bit till you see it. In this chapter we shall try to seek answers to some of these questions. The most common kind of contact thermometer uses electronic heat sensors to record body temperature. The range of this thermometer is from 35, The normal temperature of the human body is 37. These give us a feeling of coolness. The scale we use is the Celsius scale, indicated by oC. In winter you feel cold inside the house. Hold the thermometer vertically (Fig. Expansion due to heat is known as thermal expansion. It could be slightly higher or slightly lower. One such thermometer is known as the laboratory thermometer. Laboratory thermometers are designed for lab purposes such as checking boiling point, freezing point, or temperature of other substances. Combustion: On heating, some of the substance reach their ignition temperature and starts burning. Your email address will not be published. A thermometer looks like the one shown in the above figure. Take some tap water in a beaker or a mug. First, note the temperature difference indicated between the … A clinical thermometer consists of a long, narrow, uniform glass tube. You also know that cotton clothes are made from plant fibres. Obviously, it is not convenient to use the laboratory thermometer for this purpose. It is made of a thin glass tube sealed at one end and a bulb with mercury at the other end. Actually, what we call normal temperature is the average body temperature of a large number of healthy persons. 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Read the thermometer keeping the level of mercury along the line of sight. It should be read keeping the level of mercury along the line of sight (Fig. We see that some objects are cold while some are hot. EASY TO READ WITH BACKLIGHT - No touch temperature reader has a large LCD display for easy to read quick results. The clinical thermometer is designed to measure the temperature of human body only. Consider the movement of the thread of mercury. How do we find out how hot or cold an object is? Mix some cold and hot water in mug C. Now dip your left hand in mug A and the right hand in mug B. Ensure that before use the mercury level is below 35°C. If you do not have a thermometer, request a friend to share it with you. HIGH BODY TEMP ALERT - Thermometer Forehead Reader has a built in fever alert alarm. Clinical thermometer is used to measure our body temperature. Label them as A, B and C. Put cold water in mug A and hot water in mug B. This is the temperature of water at that time. 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. How do we decide which object is hotter than the other? 4.17). Thermometer is a device used for measuring temperatures. First, note the temperature difference indicated between the two bigger marks. Expansion is most in gases, less in liquids and least in solids. You will also find a scale on the thermometer. Ensure that it falls below 35 oC. Outside the bulb, a small shining thread of mercury can be seen. Why does the mercury not fall or rise in a clinical thermometer when taken out of the mouth? You also know that some objects are hotter than others while some are colder than others. You might have wondered why particular types of clothes are suitable for a particular season. 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. Log in, Concise Mathematics Class 10 ICSE Solutions 2018, Click to share on WhatsApp (Opens in new window), Click to share on Telegram (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on Tumblr (Opens in new window), Click to share on Pinterest (Opens in new window). So heat causes combustion. We wear woollen clothes during winters when it is cold outside. clinical thermometer One of a variety of devices for measuring and indicating the temperature of the human body. Do both the hands get the same feeling? Expansion: All state of matter i.e., solid, liquid or gas expand on heating and contract on cooling. It prevents mercury level from falling on its own. It has a bulb at one end. Also, as you did in the case of the clinical thermometer, find out how much a small division on this thermometer reads. Wash the thermometer, preferably with an antiseptic solution. For example, 100.2 degrees is between 100 and 101 while 102 degrees is between 102 and 103. The thermometer that measures our body temperature is called a clinical thermometer. You would need this information to read the thermometer correctly. 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. How do we know whether an object is hot or cold? 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. It should be ensured that the mercury level is below 35°C before use. Observe the movement of mercury in the thermometer. 3 color display temperature … A medical thermometer (also called clinical thermometer) is used for measuring human or animal body temperature. Keeping the container wrapped in woollen material or inside a heat resistant container. 3). Also note down the number of divisions (shown by smaller marks) between these marks.