HUH? I don't quite understand :(?

Question

O.k The first law of thermaldynamics states that energy cannot be created nor destroyed. Could someone please give me a better understanding of that?

Answer 1

Energy is inherent in all matter. Even if you burn fuel, the waste gasses or products that are created still contain atoms and molecules that contain energy. It never goes away, it just changes form and such.

Answer 2

Thermodynamics is a funny subject. The first time you go through it, you don't understand it at all. The second time you go through it, you think you understand it, except for one or two small points. The third time you go through it, you know you don't understand it, but by that time you are so used to it, it doesn't bother you any more.

Seriously:

The laws of thermodynamics
Main article: Laws of thermodynamics
In thermodynamics, there are four laws of very general validity, and as such they do not depend on the details of the interactions or the systems being studied. Hence, they can be applied to systems about which one knows nothing other than the balance of energy and matter transfer.
The four laws are:

Zeroth law of thermodynamics, stating that thermodynamic equilibrium is an equivalence relation.
If two thermodynamic systems are in thermal equilibrium with a third, they are also in thermal equilibrium with each other.

First law of thermodynamics, about the conservation of energy
The increase in the energy of a closed system is equal to the amount of energy added to the system by heating, minus the amount lost in the form of work done by the system on its surroundings.

Second law of thermodynamics, about entropy
The total entropy of any isolated thermodynamic system tends to increase over time, approaching a maximum value.

Third law of thermodynamics, about absolute zero temperature
As a system asymptotically approaches absolute zero of temperature all processes virtually cease and the entropy of the system asymptotically approaches a minimum value.

Answer 3

it's just there