masskonservation
Mass conservation, also called the conservation of mass, is a fundamental principle stating that in an isolated system the total mass remains constant over time. In classical physics and chemistry, mass is neither created nor destroyed; it can change form (solid, liquid, gas) but the total amount of mass is preserved. This principle underpins chemical reactions, material balances, and many engineering calculations.
In chemical reactions, the mass of the reactants equals the mass of the products when all species
In fluid dynamics, the conservation of mass is expressed by the continuity equation. For a density ρ
In modern physics, the concept is refined by mass–energy equivalence. While total energy and momentum are conserved
Limitations include open systems, where mass can cross boundaries, and measurement or identification issues in complex
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