The Density Calculator uses the formula p=m/V, or density (p) is equal to mass (m) divided by volume (V). The calculator can use any two of the values to calculate the third. Density is defined as mass per unit volume.
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There are 16 protons, 18 electrons and 16 neutrons. I hope this helped:)
It is called convection. When warm air, or current, moves up and disperse outwards as cold air, or current, moves into the warmer region.
I believe the answer you're looking for is, D. The motion of atoms and molecules.