The response time of a liquid-in-glass thermometer varies according to the kind of thermometer, its bulb volume, thickness and overall weight. Liquid-In-Glass Thermometers . The mercury-in-glass or mercury thermometer was invented by physicist Daniel Gabriel Fahrenheit in Amsterdam (1714). Another type is a digital thermometer, which uses electronics to … Liquid-in-glass thermometers measure the thermal expansion of a liquid, which is placed in a solid container, on a length scale. However, mercury is a toxic heavy metal, and mercury has only been used in clinical thermometers if protected from breakage of the tube. A Liquid-in-Glass Thermometer is a glass capillary tube having a liquid-filled bulb present at one end. This page was last edited on 7 June 2018, at 13:08. 2. Liquid-filled thermometers are made of specific types of glass and are subjected to special thermal treatment, called aging, which eliminates shifting of the zero point on the scale caused by repeated heating and cooling of the thermometer (correction for shifting of the zero point must be made in … One type of thermometer is a narrow, concealed glass tube containing mercury or alcohol which extends along the tube as it expands. Its construction is shown in the Figure 1. Stop breakage" - NARA - 514902.jpg, "Lives depend on fragile thermometers. The mercury thermometer is one example of liquid thermometers. Mercury thermometer (mercury-in-glass thermometer) for measurement of room temperature. About H-B Thermometers. Mercury = Mercury-in-glass thermometers have been considered the most accurate liquid-filled types. Laboratory Thermometer Features. Thus, temperature conversion would be needed if the temperature reading is wanted in some other scale. A typical liquid-in-glass thermometer is shown in the figure below. These thermometers display temperature either in Celsius or Fahrenheit scales. Although their thermal expansion is high but they are non linear and their use is restricted for high temperatures. “An error can be produced when the thermometer is not immersed to the same extent as it was when it was originally cal… This temperature should be recorded because a glass thermometer does not offer a recall of the measured temperature.”. An 'emergent stem correction' may be necessary when it is not possible to immerse the thermometer sufficiently deeply.”. A fair reading is given within -200 to 600 °C. Sometimes thermometers with liquids are used, but not with mercury. After deciding the range its upper end is sealed. They employ alcohol as the filled in liquid in glass tubes. A thermometer is an instrument for measuring or showing temperature (how hot or cold something is). Daniel Fahrenheit's application of mercury and a standardized temperature scale for liquid-in-glass thermometers ushered in a new era of accuracy and precision in thermometry. The more the thermal expansion of the liquid, the highly sensitive the thermometer is. Kinds of thermometers. Liquid element contained in a glass thermometer may be perilous or risky to health owing to their potential chemical spills. Design features. Liquid-in-glass [edit | edit source] Liquid-in-glass thermometer is the oldest and widest type of temperature measurement device used nowadays. At the bottom of the glass tube a small bulb is blown, in which the liquid mercury is kept. They can not be applied in regions where highly accurate results are desirable. [1] History A large mercury in glass thermometer. 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