A process in which something is changed from a liquid to a gaseous substance without its temperature reaching boiling point: "Evaporation consists of a fluid that has been changed into a vapor; usually, by means of the slow process that occurs below the boiling point of the liquid."

1. An evaporation technique in which the evaporant is heated with electron bombardment.
2. An electronic transducer, either fixed or adjustable, that reduces the amplitude of a wave without causing significant distortion.

Electron beam evaporation is a commonly used process for coating lenses and filters with anti-reflection, scratch-resistant or other specialized coatings.

The process is also commonly used for coating insulating and resistor films on electronic components.

A containment pond designed to hold liquid wastes and to concentrate the waste through a process of decreasing the amount of water: "The evaporation pond reduces the amount of water so the waste material is more visible and easier to dispose of."

The rate at which a particular substance will be changed into a gas when compared to the rate of a known substance; such as, ethyl ether: "The evaporation rate is especially useful for health and fire-hazard considerations."