The formula for the compound containing one phosphorus atom and two fluorine atoms, PF2, is PF2. In this compound, phosphorus has a charge of +3 and each fluorine atom has a charge of -1. Therefore, the chemical formula is written as PF2 to indicate the ratio of atoms in the compound.
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It is the locus of a point such that the sum of its distance from two (distinct) fixed points is a constant. So, given two fixed points, F1 and F2, an ellipse is the locus of the point P such that PF1 + PF2 is a constant. That would be an ellipsoid, a 3 dimensional thing. The 2 distances have to be measured in a fixed (2 dimensional) plane.
a formula is a formula <3 simples!
explain formula transformation
There is no formula for measurement.
what formula?