Hot liquid mixed with a cold liquid

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SUMMARY

The discussion centers on the temperature behavior of a mixture when a hot liquid is combined with a cold liquid. It is established that the temperature of the mixture is initially "undefined" during the mixing process, which takes time, leading to readings that fluctuate between the temperatures of the hot and cold liquids. Participants clarify that from the perspective of the hot liquid, the temperature decreases, while from the cold liquid's perspective, it increases until reaching a constant state. The importance of recognizing the time factor in mixing is emphasized, particularly in practical applications like baking.

PREREQUISITES
  • Understanding of thermal dynamics and temperature measurement
  • Familiarity with the concept of heat transfer
  • Basic knowledge of mixing processes in physical chemistry
  • Experience with practical applications of mixing, such as in cooking or baking
NEXT STEPS
  • Research the principles of heat transfer in liquids
  • Explore the concept of thermal equilibrium in mixing
  • Learn about the time-dependent behavior of temperature in dynamic systems
  • Investigate practical examples of mixing in culinary science
USEFUL FOR

Students of physical chemistry, culinary professionals, and anyone interested in the principles of heat transfer and mixing processes.

Elena14
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My textbook says - When a hot liquid is mixed with a cold liquid, the temperature of the mixture -
"is undefined for some time and then becomes nearly constant".
Shouldn't the temperature first decrease and then become constant ? Why does it say "undefined" ?
 
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The mixing process takes some time during which a temperature reading can give 'anything' between Thot and Tcold. So it's not completely undefined.

Your perspective is apparently from the hot liquid ? Because for the cold liquid the temperature increases and then becomes constant !
 
BvU said:
The mixing process takes some time during which a temperature reading can give 'anything' between Thot and Tcold. So it's not completely undefined.

Your perspective is apparently from the hot liquid ? Because for the cold liquid the temperature increases and then becomes constant !

I haven't really come across this fact that the mixing process takes time. Will you please elaborate on this one?
 
Elena14 said:
I haven't really come across this fact that the mixing process takes time. Will you please elaborate on this one?
If you have ever baked a cake, you will know that mixing is one of the steps. That step is not instantaneous.
 

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