Respuesta :
Thermal energy flows until one substance is warmer than the other substance.
When thermal energy flow from one substance to another?
There is a net flow of thermal energy transferred between two substances until one substance is warmer than the other because thermal energy flows when there is difference in temperature. We know that thermal energy moves from the hotter body to the cool body.
So we can conclude that thermal energy flows until one substance is warmer than the other substance.
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