A student claimed that thermometers are useless because a thermometer always registers its own temperature. How would you respond?
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Answer:
No, that's completely incorrect
Explanation:
well your friend / student is partially correct because a thermometer do check it's on temp , let me explain you with an example:
consider a weighing machine, the basic mechanism of weighing machine is that it reads the external FORCE applied on it (not mass) so it shows the reading of the external force. Just like that thermometer the thermometer contains Hg (mercury) so the Kinetic Energy of the molecules increases when the external temperature is increased thus we see the mercury particle.
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