Does this mean that energy isn’t conserved in the universe?
When you calculate a free energy, the energy you are working with is the energy that you would see if you put all energy into an object, including the kinetic energy, or any energy that was available in the universe (if we were in a vacuum space).
So when the free energy you think you’re working with in the above statement is actually the energy from the kinetic energy, you are working with a misleading statement.
In the world of physics we work with energy which appears to be conserved, and we are constantly adding energy to the universe. When we calculate our energy for another situation – say you want to use the energy stored in the atoms in the earth at equilibrium to calculate the temperature of the earth or another situation, we want to know how much energy it would take to produce that energy in a new situation.
As an example lets assume you have a bunch of gas molecules in a container, but you can’t get them to release their gas. You need to get the heat of the individual molecules to release the gas. You use some kind of energy (energy conservation) to get that energy, so you’ll need a bunch of energy to keep all the molecules at equilibrium or they’ll all burn up.
Now what we know from physics is that you can’t get all the energy out of the gas molecules. So instead you need to get all the energy in the container to release the gas. Then as we all know there’s a very small amount of energy in the container. If it gets to the state we think it’s going to get it will take a big number of energy to get all that energy back out.
For an example of using Gibbs free energy as an energy conservation measure, let’s look at what happens as a result of the chemical reaction of hydrocarbon (carbon) with nitrogen (nitrogen oxide).
Atmospheric pressure is 1 bar and temperature is 2 bar, and you want to release all the heat from hydrocarbons molecules into the atmosphere by emitting methane or ethane.
You want to increase pressure, but with a great deal of energy in order to do that you need a great deal of energy to release this energy.
Atmosphere has about 0.7 W of energy per molecule, so you don’t really want to increase pressure that much to get the energy you want!
So you’ll need some form of energy conservation:
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