- a space between two electrodes, across which a discharge of electricity may take place.
- the electrodes and the space between, considered as a unit: used in ignition systems.
Origin of spark gap
First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for spark gap
An interesting experiment is found in placing a spark-gap in the flame and sending a series of sparks across it.Artificial Light
Every time the transmitting table is about to start its forward stroke a powerful spark is produced at the spark-gap.Wireless Transmission of Photographs
Marcus J. Martin
S is the spark-gap between magnesium terminals connected to the outer coats of the Leyden jars.A Study of Splashes
Arthur Mason Worthington
Spark-gap, with the hyphen, means the air-gap between the opposed faces of the electrodes in which sparks are produced.The Radio Amateur's Hand Book
A. Frederick Collins
"Willie might be listening in," he explained, as the sparks began to leap between the points of his spark-gap.The Young Wireless Operator--As a Fire Patrol
Lewis E. Theiss
- the space between two electrodes across which a spark can jumpSometimes shortened to: gap
- A gap in an otherwise closed electric circuit across which a discharge occurs at a prescribed voltage. The discharge often causes ionization of the surrounding gas and thereby very high temperatures, and can be exploited, as in spark plugs, to ignite engine fuel in a combustion chamber.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.