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How to use mercury in a thermometer? | Chemistry
How to use mercury in a thermometer? B> Have you ever wondered how come you do not use any other chemical element for measuring temperature in a thermometer? Why live?
Mercury is a chemical element in the periodic system of elements wears the symbol Hg
b> Have you ever wondered how come you do not use any other chemical element for measuring temperature in a thermometer? Why live?
Mercury is a chemical element in the periodic system of elements wears the symbol Hg . name comes from the Latin word Hydrargyrum meaning liquid silver. It is heavy, silvery-white metal that is liquid at room temperature, and characterized by the fact that poorly conducts heat and electricity.
The only way to We measure the heat of a body by means of action and heat in a particular subject and based on the changes which heat causes in this case. And you can understand why this is so. Heat and cold cause changes in many substances and objects. thermometer is needed for such a substance that will , at the same temperature, always behave the same.
was found to be alive especially well suited for this purpose. Heat causes expansion of mercury, but it is still spreading the same at the same temperature. Because mercury put into a glass tube and she, when the tube is heated, expands and raises the same point on the tube whenever it is exposed to the same temperature.
Adding scale to the glass tube will get a s. In the modern thermometer hole in the tube is often thinner than a human hair, and usually no bigger than a pin. Ball thickening at the bottom of the tube and the tubes themselves were filled with the quantity of mercury that is necessary to be able to measure certain temperature . Then the tube is closed, and so that its upper end in a vacuum, or airless space, or a gas such as nitrogen. In such a tube the mercury rises and falls, in accordance with the temperature around it.
thermometers are commonly used two scales: Celsius and Fahrenheit. Celzijevoj The scale corresponds to zero temperature at which water freezes, and the hundredth degree corresponds to a temperature at which water is boiling. On Fahrenheitovoj scale the freezing point or freezing point of water is located at 32 degrees and the boiling point or boiling point of 212 degrees.
When you use a thermometer to measure body temperature of the mercury column stands at the highest point that it has reached all the while, shudder tube, do not drop down.