I had an experiment where we measured boiling and freezing points of water with
ID: 2033925 • Letter: I
Question
I had an experiment where we measured boiling and freezing points of water with thermistor, thermocouple, uncalibrated thermometee, platinum resistance. How do i explain that temperature is directly proportional to resistance, voltage, length of alcohol in uncalibrated thermometer? I had an experiment where we measured boiling and freezing points of water with thermistor, thermocouple, uncalibrated thermometee, platinum resistance. How do i explain that temperature is directly proportional to resistance, voltage, length of alcohol in uncalibrated thermometer?Explanation / Answer
You have a thermistor, thermocouple, uncalibrated thermometer, and platinum resistance thermometer.
We know that resistance of thermistor is inversely proportional to temperature. Hence if we measure the boiling and freezing points of water then you observe that resistance of thermometer when measured at boiling point of water is less than when measured at freezing point. Hence thermistor is used to show that resistance is inversely proportional to temperature.
Platinum has positive temperature coefficient means resistance of platinum is increases with temperature that is resistance is directly proportional to temperature. Hence resistance of platinum resistance thermometer when you measure the boiling point of the water is greater than when measured at freezing point. Hence by using platinum resistance thermometer you can show that temperature is directly proportional to the temperature.
Now, thermocouple works on the principle that when two ends of thermocouple are at different temperatures then voltage produced across that two ends is directly proportional to temperature difference between two ends. Hence by using thermocouple you can show that the temperature is directly proportional to the voltage.
If we use uncalibrated thermometer, we know that thermometer works on the principle of the expansion of alcohol. Expansion of the alcohol is propositional to the temperature. Hence if you measure the temperature by using thermometer the length of the alcohol in thermometer when measured at freezing point of water is less than when measured at boiling point of water. As temperature increases the length of the alcohol in thermometer increases due to expansion of the alcohol.
In this way you can explain that temperature is directly proportional to the resistance , voltage and length of the alcohol in the uncalibrated thermometer.
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