1st Law of Thermodynamics

What is the First Law of Thermodynamics?

Hint
$$$\Delta E=Q-W$$$
There exists for every thermodynamic system a property called the energy. The change of energy of a system is equal to the mechanical work done on the system in an adiabatic process. In a non-adiabatic process, the First Law of Thermodynamics states that the change in energy of a system is equal to the difference between the heat added to the system and the work done by the system.
$$$\Delta E=Q-W$$$
where $$E$$ is the system's energy, $$Q$$ is the heat input into the system, and $$W$$ is the work done by the system. Also note, $$E=U\:(thermal \: energy)+E_{kinetic}+E_{potential}+...$$
There exists for every thermodynamic system a property called the energy. The change of energy of a system is equal to the mechanical work done on the system in an adiabatic process. In a non-adiabatic process, the change in energy is equal to the heat added to the system minus the mechanical work done by the system.