1st law of thermodynamics??

The First Law of Thermodynamics is a statement of the conservation of energy. It states that the change in the internal energy of a system ($\Delta U$) is equal to the heat added to the system ($Q$) minus the work done by the system ($W$).

Mathematically, it is expressed as:

$$\boxed{\Delta U = Q - W}$$

Here:

• $\Delta U$ represents the change in the internal energy of the system. Internal energy is the total energy contained within a thermodynamic system, including the kinetic and potential energies of its molecules.
• $Q$ represents the heat added to the system. If heat is removed from the system, $Q$ is negative.
• $W$ represents the work done by the system. If work is done on the system, $W$ is negative (or the equation can be written as $\Delta U = Q + W_{on}$, where $W_{on}$ is work done on the system).

This law implies that energy cannot be created or destroyed, only transferred or converted from one form to another.