Reproducible thermal phenomena essential for calibrating thermometers include the boiling point and freezing point of water, which serve as fundamental fixed points in the Celsius temperature scale. However, these points are pressure-sensitive, making them unreliable for calibration without specifying the pressure conditions. The discussion emphasizes the importance of understanding phase changes and their relation to pressure, particularly in the context of the phase rule, to achieve accurate thermometer calibration.
PREREQUISITESStudents in thermodynamics, laboratory technicians involved in temperature calibration, and professionals in scientific research requiring precise temperature measurements.
I don't know, they said in the slides that to calibrate a thermometer we should place it in reproducible thermal phenomena.Bystander said:What sorts of phenomena do you think would be useful?
I don't know. I'm lost now. Then they mean by reproducible phenomena phases like steam point and melting point?Bystander said:What phase changes are not pressure sensitive? Are you familiar with "the phase rule?"
okay thanks a lotBystander said:https://www.physicsforums.com/threads/is-the-definition-of-a-phase-arbitrary.891651/#post-5609568
Follow along here, if you will, and things will become clear as mud.
The boiling point and freezing point of water are basic 'fixed points' in defining the Celsius temp scale. You are correct to state that these depend on pressure so the pressure must also be specifiedAny Help said:I don't know, they said in the slides that to calibrate a thermometer we should place it in reproducible thermal phenomena.
So what are those reproducible phenomena? do they mean boiling and melting point of water?
if they mean boiling and melting of water, as we know water is pressure sensitive so its not reliable from place to place? so how to calibrate thermometer with that? it won't be precise.