In chromatography, furrows or breaks in an ion-exchange bed which permit a solution to run through without having contact with active groups elsewhere in the bed.

A type of multiplex transmission in which the separation between communication channels is accomplished through the use of carriers or subcarriers.

The transmission of extra particles through a medium in a nuclear reactor due to the presence of voids in the medium.

A condition occurring in a water-drive reservoir in which oil is bypassed because of erratic or uncontrolled water encroachment; can be aggravated by excessive production rates.

The steering of energetic charged particles by the atomic rows or atomic planes of a crystalline solid.