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### Heat VS. Energy

Posted: Sun Feb 03, 2019 11:48 am
So I'm still unclear as to what the difference between heat and energy/enthalpy is. I always sort of thought they were the same thing since adding heat to something increases energy. So by adding heat aren't you adding energy? Why aren't the terms interchangeable?

### Re: Heat VS. Energy

Posted: Sun Feb 03, 2019 12:34 pm
I think of heat as a form of energy (thermal energy). However, energy can be more than just heat (e.g. work)

### Re: Heat VS. Energy

Posted: Sun Feb 03, 2019 12:43 pm
The textbook defines heat as the energy that is transferred as a result of temperature differences, whereas enthalpy refers to heat transfer. Energy itself is the capacity of a system to do work.

### Re: Heat VS. Energy

Posted: Sun Feb 03, 2019 2:54 pm
Enthalpy is the overall change of energy within a system, while heat is the exchange of thermal energy that causes a temperature difference. Internal Energy (U) is the sum of all bonds and inter molecular relations within a system (Generally unable to be calculated), so we calculate the change in U with the heat absorbed/released by a system (q) and the work done onto/by the system (w). Delta U=q+w

### Re: Heat VS. Energy

Posted: Sun Feb 03, 2019 3:02 pm
Energy is the ability of a system to do work and the change of energy, while heat is the energy being transferred.

### Re: Heat VS. Energy

Posted: Sun Feb 03, 2019 11:22 pm
heat=energy and enthalpy is the transfer of heat/energy