I Hot liquid mixed with a cold liquid

AI Thread Summary
When hot and cold liquids are mixed, the temperature initially fluctuates between the temperatures of the two liquids before stabilizing. The term "undefined" refers to the transient state during mixing, where the temperature is not fixed. This process takes time, as the heat transfer occurs gradually, leading to varying temperature readings. The discussion highlights the importance of understanding that mixing is not instantaneous, akin to the mixing process in baking. Ultimately, the temperature will eventually reach a constant value once equilibrium is achieved.
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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