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Camille - All About Thermometers


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Camille - All About Thermometers

  1. 1. All About Thermometers By Camille Marcon
  2. 2. Different Types of Thermometers <ul><li>Alcohol Thermometers </li></ul><ul><li>Mercury-in-glass Thermometers </li></ul><ul><li>Medical or Digital Thermometers </li></ul><ul><li>Pill Thermometer </li></ul><ul><li>Galileo Thermometer </li></ul><ul><li>Infrared Thermometer </li></ul><ul><li>These are only a few of many different types of thermometers, but I will be focusing on the first three in my presentation. </li></ul>
  3. 3. How Alcohol thermometers operate… <ul><li>The Alcohol Thermometer, also known as the spirit thermometer, is used in many ways. </li></ul><ul><li>There is an organic liquid that is contained in a glass bulb which is connected to a capillary, wall which a one layer metal insulator that’s really thin so that gasses and molecules can pass through them, is in the same glass and the end is sealed with an expansion bulb. </li></ul><ul><li>The space above the liquid is filled with nitrogen and the vapor from the liquid. </li></ul><ul><li>In the working temperature range the space in between the two surfaces and the liquid, lies that capillary. </li></ul><ul><li>As the temperature increases, the volume of the liquid expands and moves up the capillary. This happens when heat is applied to the tip of the thermometer. </li></ul>
  4. 4. What Liquids are used… <ul><li>The liquid in an alcohol thermometer, usually depends on the manufacturer. </li></ul><ul><li>Some liquids used are, ethanol, toluene, kerosene, or Isoamyl acetate . </li></ul><ul><li>Since most of the liquids are transparent, they are made visible by adding red or blue dye . </li></ul>Kerosene Toluene Isoamyl acetate Ethanol
  5. 5. Mercury-in-glass Thermometers <ul><li>Invented by German physics by the name of Daniel Gabriel Fahrenheit. </li></ul><ul><li>These thermometers work very similarly to the alcohol thermometers. </li></ul><ul><li>The mercury is in a glass tube, and when heat is applied the mercury rises. </li></ul><ul><li>There are numbers on the outside of the tube to make it possible to read the temperature level. </li></ul>Mercury-In-Glass Thermometer
  6. 6. Medical or Digital Thermometers <ul><li>Digital or medical Thermometers are used to measure body heat mostly. </li></ul><ul><li>These types of thermometers do not contain a liquid inside that indicates when the temperature rises. </li></ul><ul><li>Instead, a thermistor is installed inside the thermometer </li></ul><ul><li>A thermistor is a device that is powered by electricity and is trigered from an outside source. </li></ul><ul><li>When the tip of the thermometer is heated, it switches from an insulator to a conductor of electricity depending on how hot it is. </li></ul>One type of Thermistor