Draw and explain filled system thermometer.

Draw and explain filled system thermometer.
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1 Answer

Answer :

➢ Filled system thermometer

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Explanation:- Many physical properties change with temperature, such as the volume of a liquid, the length of a metal rod, the electrical resistance of a wire, the pressure of a gas kept at constant volume, and the volume of a gas kept at constant pressure. Filled-system thermometers use the phenomenon of thermal expansion of matter to measure temperature change. The filled thermal device consists of a primary element that takes the form of a reservoir or bulb, a flexible capillary tube, and a hollow Bourdon tube that actuates a signal-transmitting device and/or a local indicating temperature dial. A typical filled-system thermometer is shown in Figure. In this system, the filling fluid, either liquid or gas, expands as temperature increases. This causes the Bourdon tube to uncoil and indicate the temperature on a calibrated dial. The filling or transmitting medium is a vapor, a gas, Liquid like, Mercury, ethyl, alcohol, tolune, xylene or another liquid. The liquid-filled system is the most common because it requires a bulb with the smallest volume or permits a smaller instrument to be used. The gas-filled system uses the perfect gas law, which states the following for an ideal gas: 

T = kPV --------------------1 

Where T =temperature, K= constant, P= pressure, V= volume 

If the volume of gas in the measuring instrument is kept constant, then the ratio of the gas pressure and temperature is constant, so that 

image 

The only restrictions on Equation 1, 2 are that the temperature must be expressed in degrees Kelvin and the pressure must be in absolute units. As the temperature changes ,volume of liquid changes by following equation

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