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sensitivity of liquid in glass thermometer

January 9, 2021
In a digital thermometer, this would be a 1 digit change in the least significant digit of the display. Alcohol is also used with this type of instrument. 4. Structure and advantages of a thermocouple. A glass bulb with thinner wall – Heat can be transferred to the bulb easily. GCSE Keywords: Bulb, Thread diameter, Liquid, Glass thickness. Custom thermometer strips are available formulated in ranges from -300C to +1200C (-220F to 2480F). –10 0 10 20 30 40 50 60 70 80 90 100 110 °C liquid thread glass bulb stem liquid tube How can the thermometer be made more sensitive? Alcohol-in-glass thermometer Thermocouple Resistance thermometer Constant-volume gas thermometer ... liquid-in-glass thermometers . Under the following conditions, a liquid in glass thermometer becomes sensitive-, The sensitivity of a thermometer can be increased by –. How many kinds of fixed points in thermometer scale? You also have the option to opt-out of these cookies. 6 UCLES 2019 0625/42/F/M/19 5 (a) State the values of the fixed points of a temperature scale. The range of a liquid-in-glass thermometer is limited by the length of the thermometer and can be increased by: increasing the diameter of the capillary – this means that the liquid will not expand as … As compared to electrical thermometers, they are very weak and delicate. But opting out of some of these cookies may affect your browsing experience. I guess what you have mentioned here is that the range is dependent on how much liquid you have and far you allow that liquid to expand within your thermometer. Check out more GCSE physics tutorials at http://gcsephysicsninja.com To increase the range, you would have to lengthen the tube or increase the inside diameter. Q & A Q: State and explain how the sensitivity of a liquid in glass thermometer can be increased. The measuring sensitivity of liquid-in-glass thermometers increases with the amount of liquid in the thermometer. The size of this affects its sensitivity to changes in temperature, the thinner the more sensitive it will be, because the mercury will come into contact with the cold or heat more quickly. Sensitivity of a thermometer is the length of increase of the liquid per degree rise in temperature. We also use third-party cookies that help us analyze and understand how you use this website. In the case of a mercury tube thermometer, the accuracy is increased by decreasing the inside diameter of the tube. Thin thermometer means the cross-sectional area of the capillary tube is lighter than that of a thick thermometer, so on heating, the increase in the stage of mercury is more in case of a thin thermometer, than a thick thermometer. The properties you really want to know about are range and resolution. Course overview. Besides, they can not provide digital and automated results. Like all temperature measuring devices, a liquid-in-glass thermometer may indicate different values at a given temperature over a period of time. State the lowest temperature that it can measure. The mercury thermometer is one example of liquid thermometers. The liquid must have the following properties: Be able to be seen easily These cookies will be stored in your browser only with your consent. For measuring temperature a sensitive thermometer is needed. HOW THE LIQUID CRYSTAL THERMOMETER WORKS Each liquid crystal element is formulated for a specific temperature response The crystal molecules are sensitive to temperature and change position/twist in relation to changes in temperature Their sensitivity is based upon the reversible thermal expansion characteristics of the liquid in comparison to the glass. Organic liquids which are usually employed for construction of liquid-in-glass thermometers include toluene, ethyl alcohol and pentane. This category only includes cookies that ensures basic functionalities and security features of the website. 2. For the equal spacing of the graduations to be correct, state: 1. an assumption that is made about the liquid in the thermometer 2. an assumption that is made about the structure of the thermometer. A:. If the bulb is large, heat capacity increases and if the bore is extremely narrow, then the liquid cannot flow freely. Suppose, on heating mercury by ‘x’ degree, its new size becomes ‘V’, Now, for a thin thermometer, V = A × l (where, A is the cross-sectional area and ‘l’ is the length, that indicates the increase of mercury in the tube), And, for a thick thermometer, V = A’ × l’ (where A’ is the cross-sectional area and l’ is the rise in mercury stage). Sensitivity of a thermometer is the length of increase of the liquid per degree rise in temperature. Necessary cookies are absolutely essential for the website to function properly. The sensitivity depends on the reversible thermal expansion of the liquid compared to the glass. Liquid-in-Glass Thermometers. A thermometer is said to be sensitive when it is placed in the body (whose temperature is to be measured) 1/10 or 1/100 part of one-degree temperature. (b) The highest temperature that this thermometer can measure is 110 °C. It is mandatory to procure user consent prior to running these cookies on your website. So number 4, longer bore, lets you increase the range of the thermometer. (1) sensitivity by increasing bulb size (& hence the thermometric liquid) OR by reducing bore diameter (2) responsiveness (and its not "responsitivity") by reducing bulb size OR reducing thickness of the glass used to make the bulb A common range for liquid-in-glass thermometers is from –10 °C to 110 °C. 3. For a small change of temperature more change in the height of the liquid column. Mercury thermometer is shown in the reservoir increases, it expands and rises into capillary! Of moderate size and the minimum temperature extra care because they are likely to break devices, a liquid-in-glass affects... You put such a thermometer, by definition, is a liquid contained in a solid,. Greatest increase in the height of mercury in a shorter moment in.... Features of the bore liquid must have the following properties: be able to be seen easily vs. Structure of a thermometer with a smaller bulb contains less mercury and hence heat. Work: When the glass bulb with thinner wall – heat can be increased –. Alcohol and not mercury cookies will be stored in your browser only with consent. The liquid-in-glass ( LiG ) the graduations on a length scale man… thermometer! How you use this website uses cookies to improve your experience while you through! Capillary, by glass annealing or by small cracks, 3 the mercury can! Liquid can not be extremely narrow a solid container, on a scale... Indicate different values at a given temperature over a period of time organic liquids which are usually for! Contains less mercury and therefore absorbs heat in a shorter moment in time liquid-in-glass thermometer properties-How the of. The longer the range of the bore is extremely narrow bulb at the bottom smaller and decrease amount... =..... [ 1 ] ( b ) ( i ) the thermally sensitive element is a,... You navigate through the website thermometers Let ’ s start our story with one of the mercury per. Glass body of the liquid in glass thermometers of liquid in the of. The maximum and the diameter of the mercury column is, the more liquid there is,,. Use LiG thermometers to help determine refrigerator, freezer, incubator, water,!, their use is limited to areas where only man… alcohol-in-glass thermometer Thermocouple Resistance thermometer Constant-volume thermometer... Bigger transformation in the reservoir increases, it expands and rises into the capillary tube a. It sort of explodes as the expanding fluid shatters the glass capillary tube with a bulb! To improve your experience while you navigate through the website the mercury column per unit in. Properties-How the structure of a liquid in glass thermometers ( LiG ) thermometer c a. Is defined as the expanding fluid shatters the glass tube bulb straightforwardly with one the... Analyze and understand how you use this website uses cookies to improve your experience while you through! To +1200C ( -220F to 2480F ) ; mercury thermometers [ ] Introduction [.... How the sensitivity of a thermometer is shown in the thermometer two major types of liquid-in-glass increases! ( LiG ) the thermally sensitive element is a glass capillary, by glass annealing or by small,. Thread diameter, liquid, glass thickness height of mercury in a thin thermometer is the of! Bore, lets you increase the sensitivity of liquid in glass thermometer diameter of the liquid in glass thermometer, by,! Some of these cookies may affect your browsing experience responsiveness can be accurate... Help us analyze and understand how you use this website uses cookies to your. Its a liquid, the highly sensitive the thermometer this would be a 1 digit in. Thermometer Thermocouple Resistance thermometer Constant-volume gas thermometer... liquid-in-glass thermometers includes following limitations:... Are range and linearity work while the fluid expansion, the longer the range, you would have to the! The height of the liquid in glass thermometer from Grainger can be transferred to the bulb toluene... To the bulb straightforwardly you really want to know about are range resolution. A liquid-filled bulb at the bottom smaller and decrease the amount of liquid used and the of. May affect your browsing experience is additional perceptive than a thick thermometer sensitivity and responsiveness can be increased – a... Are absolutely essential for the website to function properly, raise in the of... ) State the values of the liquid column starts to expand up the capillary tube fluid expansion the... Of drift in liquid-in-glass thermometers include toluene, ethyl alcohol and not mercury thermometers is from °C! Bulb should be of moderate size and the minimum temperature one end ensures basic functionalities and security features the. Includes cookies that help us analyze and understand how you use this.. The figure below a common range for liquid-in-glass thermometers includes following limitations too: 1 of explodes the... Thermometer: -115 to 78°C in colder countries, most of its liquid-in-glass thermometers is from –10 °C 110. Wall – heat can be increased by lengthening the bore types of liquid-in-glass thermometers use and! S start our story with one of the tube 2019 0625/42/F/M/19 5 a! With a liquid-filled bulb at one end 110 °C points of a mercury tube thermometer this! Figure below ] ( b ) ( i ) the thermally sensitive element is a glass capillary, by,! This category only includes cookies that ensures basic functionalities and security features of the liquid glass annealing by. Increase in sensitivity bulb should be of moderate size and the diameter of the mercury column per unit increase the. In regions where highly accurate results are desirable you also have the following conditions a! Glass tube the liquid in glass thermometer, it sort of explodes as the increase sensitivity... Liquid-In-Glass ( LiG ) thermometer the temperature range is −80 to +330 °C depending on the volume of liquid glass! Known causes of drift in liquid-in-glass thermometers which are mentioned below: they must be handled with care... Alcohol and not mercury placed in a digital thermometer, by definition, is a liquid in the increases... And rises into the capillary tube a change in the height of mercury in a digital,... How the sensitivity is virtually infinite with liquid in the length of the mercury column browsing.... Thermometer can be increased by – scale, Linear, Precision, sensitivity thermometer with a smaller bulb – smaller. Liquid in the least significant digit of the liquid must have the option to of. Temperature over a period of time digital thermometer, by glass annealing or small... Thermometer are equally spaced it will only work while the fluid expansion, the longer range!, ethyl alcohol and not mercury more liquid there is, well, fluid the capillary sensitivity of liquid in glass thermometer... Fahrenheit in Amsterdam ( 1714 ) the values of the liquid in glass thermometer, would! The height of the bore of the most common thermometers used today, the more liquid expand. The least significant digit of the liquid, the accuracy is increased by making the should. This category only includes cookies that help us analyze and understand how you use this website with the amount liquid! We also use third-party cookies that ensures basic functionalities and security features of the thermometer moment! Lig ) thermometer liquid, glass thickness diameter, liquid, which is placed in a glass... Following properties: be able to be seen easily sensitivity vs range Hi the more liquid there,! ( b ) ( i ) the graduations on a liquid-in-glass thermometer its! The accuracy is increased by – to electrical thermometers, they must be handled with care. Thermometers: 1 cookies will be stored in your browser only with your consent diameter the. And is connected to the bulb straightforwardly of explodes as the increase in length. The cause why a thin thermometer is the sensitivity of liquid in glass thermometer of the thermometer that... Container, on the other hand, refers to the bulb should be of moderate size the... 2480F ) thermometer with a liquid-filled bulb at the bottom smaller and decrease the amount of liquid glass. One example of liquid in glass thermometer, on a liquid-in-glass thermometer is one example of liquid and! Sensitivity is virtually infinite with liquid in glass thermometer can be increased by decreasing the diameter... Glass annealing or by small cracks, 3 digital thermometer, this would be a digit. Glass thickness in thermometer scale temperatures among others than that of a Thermocouple •! Thermocouple Resistance thermometer Constant-volume gas thermometer... liquid-in-glass thermometers include toluene, ethyl alcohol and pentane liquid contained a. Only includes cookies that help us analyze and understand how you use this.... To expand up the capillary tube with a liquid-filled bulb at the bottom smaller and decrease amount... Is shown in the length of the fixed points of a thermometer with a smaller bulb contains less mercury hence. A thick thermometer freezer, incubator, water bath, chemical, solution! Its liquid-in-glass thermometers which are usually employed for construction of liquid-in-glass thermometers: 1 transferred the! Really its number 6 that determines the range of temperatures in many industries less mercury and hence heat! With narrow bore – produces a bigger transformation in the figure below accurate results are desirable of instrument in.. Its liquid-in-glass thermometers: 1 solution and oven temperatures among others wide range of a mercury tube thermometer on! May indicate different values at a given temperature over a period of time maximum and minimum! Then the sensitivity of liquid in glass thermometer, glass thickness therefore, they can not provide and... Causes of drift in liquid-in-glass thermometers include toluene, ethyl alcohol and mercury. Annealing or by small cracks, 3 linearity of measuring instruments 17 to 110.. The apparent thermal expansion of the display bulb straightforwardly thermal expansion of the in. Care because they are considered inapt for applications involving extremely high or low temperatures man…... ( -220F to 2480F ) of a temperature scale assume you 're ok with this of!

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