Glossary D

Deutsch: Destillation / Español: Destilación / Português: Destilação / Français: Distillation / Italiano: Distillazione /

Distillation refers to the first step in the refining process. During distillation, crude oil is heated in the base of a distillation tower.

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Deutsch: Gerät / Español: Dispositivo / Português: Dispositivo / Français: Dispositif / Italiano: Dispositivo /

Device can be taken to mean:

1. An electrical device designed to carry power;

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Digital command control has something to do with the method of controlling multiple trains and accessories using digital communications packets to send commands.

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Digital audio tape (DAT) has something to do with the tape which stores data digitally rather than in traditional analogue format.

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Diffraction is identified as the phenomenon of light that occurs when light passing through a narrow aperture bends when it passes around an edge.

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Differential is defined as a device - usually made of gears - that divides the torque between a vehicle's driving wheels and permits the wheels to turn at different speeds.

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Differential gear is defined as a bevel gear that permits rotation of two shafts at different speeds.

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Demand is a term to denote the amount of goods people are willing and able to buy at a given price; often coupled with supply.

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