In both cases, something is conserved - it doesn't change over time.Also, mass and energy are equivalent. If something has energy, it has mass, and vice versa.
The law of conservation of mass, or principle of mass conservation, states that for any system closed to all transfers of matter and energy (both of which have mass), the mass of the system must remain constant over time, as system mass cannot change quantity if it is not added or removed.
There are two primary laws of conservation: conservation of energy and conservation of mass.The conservation laws in essence state that while matter or energy may change form, they can never be destroyed.In a chemical reaction, the conservation of mass dictates that the mass of the products will have exactly the same mass as the reactants.The law of conservation of energy states that energy can not be created or destroyed, it can only be changed from one form to another, such as when electrical energy is changed into heat energy.See the Web Links to the left for more information.
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Conservation laws in nuclear reactions include conservation of mass-energy, conservation of electric charge, conservation of momentum, and conservation of lepton number. These laws dictate that the total mass-energy of particles before and after a nuclear reaction must remain constant, as well as the total charge and momentum. Lepton number conservation ensures the number of leptons (like electrons and neutrinos) remains the same throughout the reaction.
There are several conservation laws in physics, and many of them tell an astronomer what is, and what isn't, possible. This can help explain how certain things happen, or even predict what will happen. Among the laws of conservation that are relevant in astronomy are: conservation of mass; conservation of energy; conservation of momentum; conservation of rotational momentum; conservation of charge.
According to the law of conservation of mass, mass cannot be created or destroyed in a chemical reaction. Similarly, according to the law of conservation of matter, matter cannot be created or destroyed in a closed system. These laws demonstrate that mass and matter remain constant throughout physical or chemical changes.
If by the law of conservation you mean the Law of Conservation of Matter, then it states that matter cant be created or destroyed.
The laws of conservation of mass and conservation of energy are similar in that both state that the total amount of mass or energy in a closed system remains constant over time. However, the conservation of mass applies specifically to mass, while the conservation of energy applies to energy in its various forms (kinetic, potential, etc.).
The law of conservation of mass, or principle of mass conservation, states that for any system closed to all transfers of matter and energy (both of which have mass), the mass of the system must remain constant over time, as system mass cannot change quantity if it is not added or removed.
Conservation laws suggest that energy, matter, and momentum cannot be created or destroyed but can only change forms or be transferred between objects. Conservation of energy states that the total energy in a closed system remains constant. Conservation of matter indicates that the total mass in a closed system is constant. Conservation of momentum asserts that the total momentum of an isolated system remains constant in the absence of external forces.
Chemical reactions respect the law of mass conservation.
It's the laws of thermodynamics.
Just as the laws of conservation of matter, mass, and energy state that matter, mass, and energy cannot be created nor destroyed (in the long-term), so too do we say that particle characteristics (which derive from matter/mass/energy) such as charge cannot be created nor destroyed.
There are two primary laws of conservation: conservation of energy and conservation of mass.The conservation laws in essence state that while matter or energy may change form, they can never be destroyed.In a chemical reaction, the conservation of mass dictates that the mass of the products will have exactly the same mass as the reactants.The law of conservation of energy states that energy can not be created or destroyed, it can only be changed from one form to another, such as when electrical energy is changed into heat energy.See the Web Links to the left for more information.
albert Einstein
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While there are many more (somewhat more obscure) conservation laws throughout physics (like "Conservation of Lepton Number"), I believe the four you may be referring to are Conservation of Matter Conservation of Energy Conservation of Charge Conservation of Momentum NOTE that Conservation of Matter is not a true law (it is broken in many nuclear reactions). The other three are laws.