Hot liquid mixed with a cold liquid

  • #1
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Main Question or Discussion Point

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" ?
 

Answers and Replies

  • #2
BvU
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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 !
 
  • #3
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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 !
I haven't really come across this fact that the mixing process takes time. Will you please elaborate on this one?
 
  • #4
jbriggs444
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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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