# Hot liquid mixed with a cold liquid

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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" ?

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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 !

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?

jbriggs444