entropy
2nd opinion: thermal equilibrium
It\'s still called heat.
Heat
heat.
Heat transfer.
The energy that flows between objects with different temperatures is called heat. Heat will naturally transfer from a warmer object to a cooler object until thermal equilibrium is reached.
when heat flows Out of a system
heat flows from a warmer object to a cooler object.
heat
Heat is energy and cannot be negative, If you are talking about heat flow then if you define outflow to be negative then inflow is positive.
thermal expansion
The energy that flows between objects with different temperatures is called heat. Heat transfer occurs from a region of higher temperature to a region of lower temperature in order to reach thermal equilibrium.
It is important how heat flows because if heat didn't flow the way it does it would be to cold and we wouldn't be here.