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What are the characteristics of the following conservation laws: mass-energy, electric charge, linear momentum, angular momentum, baryon number, lepton number? Explain how they are related to fundamental laws of nature.

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Characteristics of law of conservation of mass-energy are that mass and energy are practically the same thing. And when they are viewed in that way, we know that total energy (or mass-energy to be more precise) is conserved in closed system (which means that it doesn't change in time). For example, if we consider annihilation of electron and positron we know that we will get a photon. We know that photon doesn't have mass, but we also know that electron and positron does. That doesn't mean that mass of the electron and positron has disappeared, it only means that mass of those particles has "transformed" into energy.

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