Question

state and explain the law of conservation of mass​

Answer 1

Explanation:

The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

Answer 2

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state and explain the law of conservation of mass

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$\sf{ \underline{What \: is \: Law \: of \: Conservation \: of \: Mass \: ?}}$

The law of conservation of mass states that :-

• The mass in an isolated system can neither be created nor be destroyed but can be transformed from one form to another.

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According to the law of conservation of mass, the mass of the reactants must be equal to the mass of the products for a low energy thermodynamic process.

It is believed that there are few assumptions from classical mechanics which define mass conservation. Later the law was modified with the help of quantum mechanics and special relativity that energy and mass are one conserved quantity. Antoine Laurent Lavoisier discovered the law of conservation of mass.

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$\sf{ \underline{Formula \: of \: Law \: of \: Conservation \: of \: Mass}}$

Conservation of mass can be expressed in the differential form using the continuity equation in fluid mechanics and continuum mechanics as:

$\sf{ \boxed{ \bold{ \frac{∂ρ}{∂t} + ▽(ρv)=0}}}$

Where,

• ρ is the density
• t is the time
• v is the velocity
• ⛛ is the divergence

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$\sf { \underline{Law \: of \: Conservation \: of \: Mass \: Examples}}$

• Combustion process: Burning of wood is a conservation of mass as the burning of wood involves Oxygen, Carbon dioxide, water vapor and ashes.
• Chemical reactions: To get one molecule of H2O (water) with the molecular weight of 10, Hydrogen with molecular weight 2 is added with Oxygen whose molecular weight is 8, thereby conserving the mass