Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Thermistors Thermistors work over a small range, ie. To increase sensitivity: (a) make the bore smaller (b) … This website uses cookies to improve your experience while you navigate through the website. to indicate a change in temperature. The range of a thermometer, on the other hand, refers to the dissimilarity between the maximum and the minimum temperature. GCSE Keywords: Bulb, Thread diameter, Liquid, Glass thickness. But opting out of some of these cookies may affect your browsing experience. Characteristics that make a substance suitable for use in a liquid-in-glass thermometer include: There are several types of thermometer including the. A liquid-in-glass thermometer is said to be. These cookies will be stored in your browser only with your consent. Anything that makes it easier to detect small changes in temperature increases the precision, or sensitivity of a liquid thermometer; Some of the factors which increase sensitivity are: A glass bulb with thinner wall – Heat can be transferred to the bulb easily. degree rise in temperature. 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. This website uses cookies to improve your experience while you navigate through the website. It would have to be marked with degrees of differing sizes (as above). 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 far along the tube per It is mandatory to procure user consent prior to running these cookies on your website. 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. (1) sensitivity by increasing bulb size (& hence the thermometric liquid) OR by reducing bore diameter (2) responsiveness (and its not "responsitivity") by … If the liquid did not expand uniformly, the scale would be non-linear. a low freezing and high boiling point so that the substance remains liquid over a good range of temperatures. We also use third-party cookies that help us analyze and understand how you use this website. Constant-Volume Gas Thermometers Constant-Volume Gas thermometers use the change in pressure of a gas to measure temperature. The liquid crystal thermometer – it contains heat-sensitive liquid crystals that change colour to indicate different temperatures. Capillary with narrow bore – produces a greater change in the length of the mercury column. Liquid-in-glass thermometer properties How the structure of a liquid-in-glass thermometer affects its sensitivity, range and linearity GCSE Keywords: Bulb, Thread diameter, Liquid, Glass thickness decreasing the volume of the bulb – this means there is less liquid and so it will not travel as far along the capillary It would be very difficult to calibrate and to use. It's resistance decreases with temperature. Thermochromic Liquids 17. It works over a wide rang of temperatures, and is bulky. This category only includes cookies that ensures basic functionalities and security features of the website. The sensitivity of a thermometer is defined as the increase in the length of the mercury column per unit increase in temperature. Necessary cookies are absolutely essential for the website to function properly. -5 ℃ to 70 ℃. The change in pressure is used expanding uniformly over a large temperature range, a low specific heat capacity for quick response. The sensitivity of a thermometer can be increased by Using a thermometer with a smaller bulb – A smaller bulb contains less mercury and hence absorbs heat in shorter time. These cookies do not store any personal information. We'll assume you're ok with this, but you can opt-out if you wish. To increase range: (a) make the thermometer stem longer (b) make the bore(capillary) bigger (c) use a liquid with a lower expansivity. You also have the option to opt-out of these cookies. tube as it is heated. This website uses cookies to improve your experience. Structure and advantages of a thermocouple. It is calculated in meter/degree Celsius. The constant-volume gas thermometer – it contains a gas; when the temperature rises, the pressure increases. They have low freezing points and high boiling points, allowing them to be used over a greater range of temperatures; Sensitivity is another word for precision. 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 far along the tube per degree rise in temperature.

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