Differentiate between emulsion, foam and gel

Emulsion:

A colloidal solution in which both the dispersed phase and dispersion medium are liquids is called an Emulsion.

Gel:

Gels is that kind of colloid in which the dispersed phase is a liquid and the dispersion medium is a solid.

Foam:

Foam is a substance in which the particles are gas bubbles and the medium is a liquid.

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products