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EXPERIMENT 5 - Vefa Kksal zmen 1394378 TEMPERATURE...

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Vefa Köksal Özmen 1394378 TEMPERATURE MEASUREMENT OBJECTIVE: To conduct temperature measurement tests in order to demonstrate the use of thermocouples for high temperature measurements. APPARATUS: 1) Vertical tube 2) Thermocouple calibration cell 3) Thermocouples 4) Potentiometer 5) Mercury in glass thermometer SAMPLE: Tin (Sn)
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QUESTIONS: 1) Tin used in our experiment was initially liquid at the 248 ° C , heated in the furnace. After that we let the tin cool in the furnace. From 248 ° C to 225 ° C its temperature dropped uniformly. At 225 ° C the rate of cooling is suddenly dropped. Between temperatures 225 ° C and 222 ° C, the temperature almost remained the same as the time goes by. From the cooling curve it can easily be seen that between 225 ° C and 222 ° C tin transformed from liquid into solid. And it can be concluded that 225 ° C is the melting point of tin in our experiment. 2) The melting point of the material( tin) is close to 225 ° C as seen from the data table given below. There is a thermal trap at 225 ° C. This trap is a result of constant temperature phase transformation of an almost pure metal. At normal conditions the melting point of tin is 232 ° C, but as a result of the experiment conditions it melted at 225 ° C.
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