So delta G describes the amount of energy that must be transferred into the molecule or the molecule releases into the environment to basically move between the two sides of the membrane. And to demonstrate how we can use this particular equation, let's take a look at the following diagram. So, let's suppose we have a cell membrane, and in that cell membrane we have an open channel. And the channel basically allows the movement of these sodium ions. And notice in this case, we didn't have to consider the channel because we were looking at these non polar molecules and they can simply diffuse across that membrane. So let's take a look at this particular case.