Why Did the Water's Temperature Increase Without Adding Heat?

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SUMMARY

The discussion centers on a physics problem involving a 200-gram cup of water (H2O) that experiences a temperature increase from 20°C to 25°C without any external heat being added. The conclusion drawn is that the increase in temperature is due to the melting of ice, which is also H2O, rather than any heat transfer from the environment. This scenario highlights the concept of spontaneous heat transfer and the properties of water in different states.

PREREQUISITES
  • Understanding of thermodynamics principles, specifically heat transfer.
  • Knowledge of the properties of water (H2O) in different states (liquid and solid).
  • Familiarity with the concept of spontaneous processes in physics.
  • Basic understanding of temperature measurement and its implications.
NEXT STEPS
  • Research the principles of thermodynamics, focusing on heat transfer mechanisms.
  • Study the phase changes of water, particularly the melting process and its effects on temperature.
  • Explore the concept of spontaneous processes in thermodynamics.
  • Learn about temperature measurement techniques and their accuracy in different environments.
USEFUL FOR

Students studying physics, educators teaching thermodynamics, and anyone interested in understanding the properties of water and heat transfer principles.

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Homework Statement




A cup containing 200 grams of H20 is siting on your dining room table . After carefully measuring its temperature to be 20 degree celsuis , y ou leave the room. Returning ten minutes later, you meaure its temperature again and find that it is now 25 degree celsuis. What can you conclude about the amount of heat added to water?(hint: this is a trick question)

Homework Equations





The Attempt at a Solution



My response to this question was that there is no heat added or heat is equal to zero since heat is a spontaneous process where heat flows from a hot object to a cold object. Even though there is a temperature difference involved in this process, The temperature increases rather than decreases.
 
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Ah, this is interesting...

I making a wild guess here.

Is it because ice (also H2O) in cup has melted?

If not, the question setter will say "200 g of water" instead of "200 g of H2O"

Hehe...
 

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