noun / verb
gap
GAP/ɡæp/
A separation leaving open space between things.
A gap interrupts the row of paving stones.

Etymology
The original image is a physical opening, such as a breach in a wall or hedge. This broadened to any unfilled interval, allowing gap to describe both empty space and a difference between things.
In context
Based on Professor Giopsis' calculations, about 4 minutes was enough for the potential difference between the skin and the metal frame to become high enough for sparks to jump the gap
More examples
- Cold air comes through the gap under the door.
- The mechanic gaps each spark plug before installing it.
- The gap between their incomes keeps growing.
Forms
gap · gaps · gapped · gapping