From what I have heard, entropy is the amount of energy that is unavailable to do work. What exactly does it mean by "unavailable energy", and can someone give some examples of energy being unavailable to do work in real life?
You want an example of a thermodynamic system that does work yet is unrelated to a heat engine?
A heat engine is a thermodynamic system that does work ... by definition.
So there is nothing else.
Perhaps you just need a concrete example of a heat engine?
A steam engine? A diesel motor? Stirling engine?
The heat in a gas can push a piston, but you notice that not all the heat is used up doing this?
Maximum entropy is one of the more reasonable ideas of how the Universe ends - heat death.
In gazzillions of years particles will be too spread out for any significant amount of interaction to be occurring.
All forms of life by any sane definition become impossible well before that happens.
Entropy is not a force which negates energy.
It is a measure of order/disorder within a system.
A more orderly system is more effective at doing work, because less randomness.
That's pretty much my take on it, but let's see what anybody else might say.I don't think I said that, or meant to imply that. (bolded part)
So, a more orderly system would be more effective at moving and affecting other things through actions, living or non living? And with a less orderly system, not so much?