your Doubts, Class Its price is very high. Highly effective measurement tracking and recording. 10, CBSE (g). It has a low freezing point and a high boiling point. 35.7 (96.3F) for oral temperature. Low thermal expansion coefficient. State Board, Telangana Board of These cookies will be stored in your browser only with your consent. Advantages: Quick response, versatility, portability, non-invasiveness. ii) Mercury thermometer cannot be used in very cold regions like arctic regions because it freezes below a temperature of 39o C. What are the advantages and disadvantages of mercury as thermometric liquid? The Cherub baby 4-in-1 thermometer is an ear and forehead thermometer that reads the temperature of the baby in one second. 10 Chemistry Notes, Class 10 Advantages: Disadvantages: Dual lasers assist with target area identification for more precise non-contact temperature measurement. It does not wet the interior of the glass since it has stronger cohesive force. What are the two advantages of using mercury in thermometer? Previous year papers, Olympiad Advantage of mercury : Mercury is the only one in liquid state at room temperature. Chemistry Notes, Class 9 There are two types of liquid-in-glass thermometers: 1) Mercury-In-Glass Thermometers 2) Alcohol-In-Glass Thermometers. These can all be used orally, rectally, or in the armpit. These cookies track visitors across websites and collect information to provide customized ads. Its price is very high. Theyre often cheaper and more accurate, especially at higher temperatures. The disadvantages of mercury as thermometric liquid are: i) its temperature coefficient of expansion is very low and it cannot be used to measure the temperature below -39C and above 357C. At least 13statesCalifornia, Connecticut, Illinois, Indiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, New Hampshire, Rhode Island, Oregon, and Washingtonhave passed such laws. Highly sensitivity allows it to work well over a small and narrow temperature range. It's used in thermometers because it has high coefficient of expansion. The true or accurate temperature could be secured if the laser thermometer is directed at the right object . 8 Biology Notes, Class Thermistor. Agarwal's solutions, RD Some thermistors have a large change in resistance to a change in temperature. It may cause a cut if the glass of the thermometer breaks down. unique curriculum that is the best fit for every student. The disadvantages of mercury as thermometric liquid are: i) its temperature coefficient of expansion is very low and it cannot be used to measure the temperature below -39C and above 357C. 4. Answer (1 of 4): Mercury is dangerous when exposed to any amount. disadvantages. Notes Class 11, Zoology Because metal is an excellent heat conductor, it reacts quickly to temperature changes. places where the temperature gets very low. Aggarwal Solutions for Math's, Worksheet for Get your custom essay on. glass tube with the readings/markings etched into the glass so it What qualifies you as a Vermont resident? Notes for class 7, Ask A minimum-maximum thermometer shows the minimum and maximum temperatures reached in any given period of time Answered In Uncategorized What are the disadvantage and advantage of infrared thermometer? Class 9, RS By clicking Accept All, you consent to the use of ALL the cookies. Some equipments log data 24 hours a day and 365 days of year while some logs data only during its predefined period. Radiometers are used for remote observations. It gives fairly accurate results within the temperature range of -200 to..Construction..Main Features..Applications..Advantages..Limitations.. Suggest Corrections. First the kerosene thermometer, measurement range is about - 30 ~ 150 , and the index value is bigger, cannot be measured accurately, the famous Galileo thermometer is kerosene thermometer. papers class 8 science, Important Most made in the 20th century are mercury-in-glass thermometers. point is 78 0C.) Class 11 Notes, Class Quiz for Class 6 Science, Online is neither analogue nor digital. MCQ, Important What are the advantages of mercury thermometer Class 7? reaches the temperature of the surroundings quickly. Pros- Mercury thermometers are used to provide exact readings of body temperature. Wide temperature ranges are available. -It does not wet (cling to the sides of) the tube. This cookie is set by GDPR Cookie Consent plugin. This is to help remove the threat of thermometer breakage and the subsequent release of mercury vapor indoors. This cookie is set by GDPR Cookie Consent plugin. For more information about phasing out industrial mercury thermometers, visit EPA's Phasing Out of Mercury Thermometers Used in Industrial and Laboratory Settingspage. Mercury thermometers may be used in many applications, including chemical experiments, water and acid baths, blood banks, ovens, and incubators. Education, Karnataka Examination Previous year papers, BITSAT -39 0C). smartech('create', 'ADGMOT35CHFLVDHBJNIG50K96924VTU0A9D6T0V8SJJV89KVC9EG'); As they become suspended in the air, the molecules draw some of the heat from the hotter air, cooling it down as the water and air find equilibrium. Advantages. It will be very dangerous if broken. It is known that the price of an infrared thermometer is indeed more expensive than other types of thermometer. An alcohol-in-glass thermometer can measure low temperature class 6 Math's, Worksheet for Like all other thermometers, mercury-in-glass thermometers also have their own strengths and weaknesses you should be aware of. Education, West Bengal wise Class 8 Math's Quiz, Chapter wise Verma & VK Agarwal Biology Solutions, Lakhmir Physics Notes, Class What are the advantages and disadvantages of alcohol and mercury thermometers? Questions Math's, Important class 12, Class 12th Don't use plagiarized sources. Common household uses of mercury thermometers include fever thermometers and oven, candy, and meat thermometers. Disadvantages of mercury thermometers: Mercury is toxic. Is a mercury thermometer the most accurate? (f). The Weaknesses or the disadvantages of Mercury: It cannot measure very low temperature, because its freezing point is high (-40C) Mercury is poisonous, so it harmful if its tube is broken. Advantages of mercury thermometers: Mercury thermometers provide reliable readings. The Health Care Without Harm website presents information on specific state laws, resolutions and declarations. engineering exam, More It doesn't wet the glass, so you don't get inaccurate readings if the temperature is falling. Quiz for class 11, Chapter wise Hospitals use mercury ones. The biggest advantage of alcohol is that it is not as toxic as mercury so if the alcohol thermometer breaks you will not be poisoned. What is better in a thermometer mercury or alchohol? Sample papers, CBSE Singh physics solutions, Lakhmir Advantages of using mercury in thermometer?? Previous Year Papers, Revision cannot be used for thermograph. thermometers. It doesn't require any batteries to be operated. The digital thermometer has the disadvantages of low price.a modest digital thermometer, the market price, typically is tens to hundreds. 5 Is a mercury thermometer the most accurate? Heat Physics Notes, Class 10 -It is a good conductor of heat and therefore the whole liquid reaches the temperature of the surroundings quickly. Board, Online Mercury thermometers can be used to determine body, liquid, and vapor temperature. Mercury is less sensitive than alcohol as its coefficient of expansion is less than alcohol. -It is a good conductor of heat and therefore the whole liquid reaches the temperature of the surroundings quickly. Previous year Papers, HC Verma 1) It is toxic in nature, even small traces of mercury in blood is harmful. exam, JEE It can be used both orally and under the arm. are considered as abnormally low. It is one of the oldest thermometers available in the industry. As part of a partnership EPA developed with the National Institute of Standards and Technology (NIST), NIST no longer provides calibration services for mercury thermometers. class 6 Science, Worksheet Medical Exam, Olympiads Based Questions, Biology MCQ Class 10 Civics, English fragile. causes most liquids to expand, which is how a thermometer works. However, mercury is poisonous and alcohol is NOT poisonous. The disadvantages of mercury as thermometric liquid are: i) its temperature coefficient of expansion is very low and it cannot be used to measure the temperature below -39C and above 357C. ii) Mercury thermometer cannot be used in very cold regions like arctic regions because it freezes below a temperature of 39 o C. In addition, it is a lightweight and . Sharma Solution, PS How many babies did Elizabeth of York have? This cookie is set by GDPR Cookie Consent plugin. You can read more about the impact the decision will have in NISTs February 2011 press release announcing the change. Share sensitive information only on official, secure websites. What are the disadvantages of mercury? One advantage of expanding metal is its use in thermometers. for class 10, NCERT The light sensitivity is the only disadvantage of the laser thermometers , However , they may be handled in case we take some cautions during the time of taking the temp belonging to the substance . Of all these, the Cherub Baby 4-in-1 thermometer is the best. Digital thermometer,compact, stylish, do not consist of mercury, the use would not harm to the environment. They are accurate and sensitive, having a narrow place where the mercury level rises very fast. Copyright 2022 Physics Wallah Pvt. Botany Notes, NCERT Thermometers consist of three basic elements: spirit-filled liquid, which responds to changes in heat and cold; a glass tube to house the temperature-measuring liquid; and black ink to color in the engraved scale marks with legible numbers. Its price is very high. Advantages of Mercury as a thermometric liquid. A slight amount of mercury is placed into the base of the thermometer, and as heat warms the base of the thermometer, it increases the mercury level, pushing it up a narrow tube so we can physically read the increase on the thermometer; however, at a slow pace. Advantages Comparatively inexpensive Wide temperature range (-270 C to 2100 C) Small (down to 0.25 mm diameter) Disadvantages Small signals, limited temperature resolution (0.01 C to 1 C) in some models Thermocouple wires must extend from the measurement point to the readout or ice-point junction. Possible to measure higher temperatures as in cooking. smartech('register', '6ff79e6140cd0fd5d1c68cbc03f76f50'); Learn more about how to tell if there is mercury in your fever thermometer. The cost is very low. No special tools or instruments are required for maintenance. ii) It expands on providing heat to it. 8 Math Notes, Class 8 However, you may visit "Cookie Settings" to provide a controlled consent. The average time taken by the digital thermometer to record the temperature was 88.03 seconds (95% CI-54.58 to 121.49).Conclusions: Digital thermometer is as accurate as mercury in glass . Ltd. All rights reserved. The advantages of these types of thermometers is that they are cheap, easy to read, can be submerged in liquids, require very little maintenance and are reliable. Solutions for class 8, NCERT Quiz for Class 6 Math's, Online The resistance temperature characteristics are non linear. Notes Class 12, Zoology Advantages: Greatest working range of temperature (- 268 o C to 760 o C) No head or elevation effect Disadvantages: Larger bulb size Class IV (Mercury Filled) - These thermometer is similar to liquid filled thermometer but is only filled with Mercury as instead of different kind of liquid. Platinum Resistance Thermometers (PRTs) rely on the fact that platinum, like many other metals, exhibits increased electrical resistance as temperature rises. cannot be used for thermograph. For example, a conventional PRT designed to provide 100 at 0 C has a resistance in the neighborhood of 80 at -50 C and 120 at 50 C, or a sensitivity of about 0.4 per degree. -It expands uniformly (linear expansion) and responds quickly to Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. -It is a good conductor of heat and therefore the whole liquid reaches the temperature of the surroundings quickly. Solutions, Entrance exam A lock (LockA locked padlock) or https:// means youve safely connected to the .gov website. Some states and municipalities have passed laws or ordinances barring the manufacture, sale and/or distribution of mercury fever thermometers. There are two general types of mercury thermometers that measure body temperature: Alternatives to mercury fever thermometers, Cleanup and disposal after breaking a thermometer, Learn more about how to tell if there is mercury in your fever thermometer, NISTs February 2011 press release announcing the change, final rule incorporating updated ASTM International (ASTM) standards into EPA regulations (PDF), View a list of the updated ASTM standards, Phasing Out of Mercury Thermometers Used in Industrial and Laboratory Settingspage, specific state laws, resolutions and declarations, What to do when a mercury fever thermometer breaks/spills, How to recycle and dispose of mercury products, Oral/rectal/baby thermometers, containing about 0.61 grams of mercury, Basal temperature thermometers (used to track slight changes in body temperature), containing about 2.25 grams of mercury.
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