In beginning of 20th century, Einsteinâ€™s relativity theory had come with striking results and changed the concept of mass absoluteness. Result of that theory explained that mass and energy can be taken as equivalents to each and can be converted from one to another. This law is known as the law of conservation of mass-energy or mass energy equivalence. Relation between mass and energy is given by the famous formula i.e., E = mc^2.
This law states that the amount of mass and energy can neither be created nor destroyed in any situation, it can only be converted from one form to the other. According to this law, total energy of any object will be equal to its mass at rest, and only when its kinetic increases, its mass will increase.
This law is useful in various applications like in the determination of the mass of gaseous products and reactants that are used in chemical reactions, in proper visualization of the arrangements of atoms in chemical reactions, and for balancing several reactions.
Law of conservation of mass is a fundamental law which was given by the great scientist, Antoine Lavoisier in 1789. This law can be stated as- in an isolated system despite of physical and chemical changes, mass remains conserved i.e., mass cannot be created nor destroyed. In other words, if one talks about chemical reactions, then the right-hand side product mass will always be equal to the left-hand side product mass.
Take the example of the figure above in which 100 g coal has been placed on the hot plate with complete isolation and after sometime, the entire amount of coal is burned but when the mass is measured, it turns out to be 100 g which is exactly equal to the initial one. So, it can be said that mass in an isolated system can neither be created nor destroyed, it remains exactly the same.
One more theory is that the mass of water will not change in the changing states of matter from liquid to solid or gas.
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