This means that no heat will be transferred from one object to another if the temperature of the two objects is the same. Wool is a poor conductor of heat. But our sense of touch is not enough in telling us whether an object is really hot or cold so, this can be understood by performing a simple activity. When we see a magnified image of the mercury thread in its tube, then a position will come. Both the clinical thermometer and laboratory thermometer are mercury thermometers. Precautions while Reading the Thermometer Clinical thermometer can never be used for measuring the temperature of any object other than human body. Hot and Cold The double walls of the refrigerators having space inside which is filled with an insulating material, prevent the heat of the surroundings from reaching the inside of the refrigerator. A laboratory thermometer, which is colloquially known as the lab thermometer, is used for measuring temperatures other than the human body temperature. The graduation marked on the tube of a laboratory thermometer can measure the temperature from -10°C to 110°C, this is known as the range of a laboratory thermometer. When it moves up and down in the capillary due to cohesive properties of mercury it do not allow to leave any traces on the inside of the capillary. During hot summer days, people prefer to wear white clothes or light coloured clothes because light coloured clothes absorb less heat from the sun and hence, keep us cool and comfortable in hot weather while in the cold winter days people prefer to wear dark clothes because the dark coloured clothes absorb more heat rays from the sun and keep us warm in winter season. 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In case of fever, it is used by a doctor (or at home) to measure the temperature of the patient. The clinical thermometer should be read by keeping the level of mercury along the line of sight. Bad conductors of heat are those materials which do not allow heat to be conducted through them easily. (ii) Both have a bulb at one end. Digital thermometers are an advance to the existing clinical thermometers; Due to high toxicity of the Mercury present in clinical thermometers and difficulty in its disposal in cases when the thermometer breaks digital thermometers are manufactured that can measure … A high temperature of a body indicates that it is very hot whereas a low temperature of the object indicates that it is quite cold, e.g. There are most of the common thermometers like mercury thermometers which use a liquid metal called mercury for their working. There are three ways through which heat can be transferred from a hot object to a cold object. NCERT Solutions for Class 7 Science Chapter 4 Heat. The temperature of an object should always be stated with its unit. There is a glass bulb at one end of the glass tube which consists of mercury as shown in the figure given below: Features of a Clinical Thermometer Answer: Similarities : (i) Both consist of a long, narrow and uniform glass tube. Copyright © 2020 Entrancei. Class 7 Chemistry Heat. Uses of Good and Bad Conductors of Heat NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Reading a Laboratory Thermometer Wash the clinical thermometer before and after using preferably with an antiseptic solution. The two thinner blankets (one on top of the other) during the winter season are very much effective because the air layer trapped between the thinner blankets creates insulation and provides the protection from cold. These get filled with air which is a bad conductor of heat. Materials which allow heat to be conducted through them easily are conductors of heat. Laboratory thermometer comes completely with an anti-roll triangle and a case. Digital thermometer. The heat is transferred from the fire to our face by the process of radiation. Clothes 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). This will give us the temperature of hot water taken in the beaker. It is used to measure the temperatures in school or other laboratories for scientific purpose as they measure temperatures to a range higher than clinical thermometers.