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In physics the final position minus the initial position is the displacement, usually occurring after a movement. For example, if a jet takes off from JFK airport (like that's going to happen any time soon) and its connecting flight is in L.A. to Miami. Where it then proceeds back to the JFK airport, its distance is somewhere between 7,000 and 12,000 miles (I'm not familiar with those distances), however its displacement is almost zero. I say almost because it depends on which gate the plane left.
Now, in chemistry and time you have a variable (e.g position) and you take the final minus the initial, you get the delta, or change, in position. This can then be used to find a number of problems.
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