Definition

Noun: A condensation pump is a type of vacuum pump designed to achieve a very high vacuum (an extremely low-pressure environment). It operates on the principle of capturing gas molecules by causing them to condense (change from a gas to a liquid or solid state) on a cooled surface inside the pump.

Usage

The term is used in scientific and engineering contexts, particularly in physics, chemistry, and materials science, to describe equipment for creating high-vacuum conditions. * A condensation pump is essential for experiments in surface science. * The old condensation pump was replaced with a more modern turbomolecular pump. * Achieving the necessary vacuum required a high-quality condensation pump.

Advanced Usage

• Technical Operation: In technical literature, the term often specifies a pump where a cryogenic (very cold) surface traps and removes gas molecules from a chamber, distinguishing it from pumps that operate by mechanical displacement or momentum transfer.
• Historical Context: The condensation pump, particularly the diffusion pump (a common type of condensation pump), was a foundational technology for high-vacuum applications throughout much of the 20th century.

Variants and Related Words

• Diffusion Pump: A specific and common type of condensation pump where a stream of vapor (often oil or mercury) diffuses gas molecules toward the pump walls where they condense.
• Cryopump: A modern type of pump that uses extremely cold surfaces to condense and trap gases, representing an advanced form of condensation pumping.
• High-Vacuum Pump: A broader category that includes condensation pumps, turbomolecular pumps, and ion pumps.

Synonyms

• Diffusion pump (a subtype)
• Vapor diffusion pump
• High-vacuum pump (broader term)

Related Phrases

• To achieve a high vacuum using a condensation pump: Describes the primary function.
  • The chamber was evacuated to 10^-6 Torr using a condensation pump.
• Condensation pump fluid/oil: Refers to the working fluid used in many such pumps.
  • The performance degraded because the condensation pump oil needed to be changed.

Noun

1. vacuum pump used to obtain a high vacuum