Conservation laws are fundamental to our understanding of the physical world, in that they describe which processes can or cannot occur in nature. For example, the conservation law of energy states that the total quantity of … See more

The total amount of some conserved quantity in the universe could remain unchanged if an equal amount were to appear at one point A and simultaneously disappear from … See more

Conservation equations can usually also be expressed in integral form: the advantage of the latter is substantially that it requires less smoothness of the solution, which paves the way to weak form, extending the class of admissible solutions to include … See more

A partial listing of physical conservation equations due to symmetry that are said to be exact laws, or more precisely have never been proven to be violated:
Another exact … See more

There are also approximate conservation laws. These are approximately true in particular situations, such as low speeds, short time scales, or certain interactions.
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In continuum mechanics, the most general form of an exact conservation law is given by a continuity equation. For example, conservation of … See more

• Invariant (physics)
• Momentum
• Energy
• Conservative system
• Conserved quantity
• Principle of mutability See more