Heat and the First Law
When a hot cup of tea is left in a room in contact with the ambient air, we know that eventually the tea cools and the air warms until the temperature of the cup of tea and the surrounding air are the same.
The 1st Law tells us that the decrease in the internal energy of the cup of tea is equal to the increase in the internal energy of the surrounding air.
(Time Passes)
Cool Tea
Tobj = Tsurr
Qloss
Tobj >Tsurr
Hot Tea
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