air gap

noun

Electricity. the space between two objects magnetically related, as between the rotor and the stator in a dynamo, or between two objects electrically related, as between the electrode and the tip of a spark plug.

Origin of air gap

First recorded in 1895–1900

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

I have tried cleaning the glass inside and out, but the etching appears to be on the glass facing the air gap between the panes.
Cloudy double-pane windows are to be expected with time | Jeanne Huber | January 11, 2021 | Washington Post
But it is only by raising the voltage of the current that even a short air gap can be bridged by the spark.
The Gasoline Motor | Harold Whiting Slauson
The current crosses the air-gap between the metal and the negative pole, forms an arc, and rapidly fuses the metal.
The New Gresham Encyclopedia | Various
The air-gap flux per pole, therefore, depends on the current taken by the motor.
The New Gresham Encyclopedia | Various
The torque produced is proportional to the product of the air-gap flux per pole and the armature current.
The New Gresham Encyclopedia | Various

Our terrestrial voltages are baffled by an air-gap of a few inches, but lightning springs across a gap miles wide.
Marvels of Scientific Invention | Thomas W. Corbin

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