Is the fractional distillation of liquefied air a physical or chemical change?

Fractional distillation involves 2 main stages and both are physical state changes. It can only work with liquids with different boiling points but the boiling points can be quite close together.

Because electrons have negligible mass, to account for the mass of the isotope, there must be 16 neutrons, 16 neutrally charged, massive, fundamental particles present in the sulfur nucleus. and thus finally, if we have the 32s2− ion, there are 18 electrons, 16 protons, and 16 neutrons.

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