Definition

1. Noun:
   • A type of vacuum pump: A diffusion pump is a device used to create a very high vacuum (an environment with extremely low gas pressure) by using a high-speed jet of vapor to push gas molecules out of a chamber.

Usage

• The term "diffusion pump" is a technical noun used primarily in physics, engineering, and industrial contexts. It refers to a specific piece of equipment.
• It is typically used as a subject or object in a sentence describing laboratory setups, manufacturing processes, or scientific experiments requiring a high vacuum.

Examples

• Noun:
  • The laboratory's high-vacuum system relies on a diffusion pump.
  • To achieve the necessary vacuum for the experiment, they used a diffusion pump.
  • Older models of electron microscopes often employed a diffusion pump.

Advanced Usage

• "to be backed by a diffusion pump": A phrase describing a vacuum system where a diffusion pump is the primary or final stage for achieving high vacuum.
  • The chamber is backed by a diffusion pump and a roughing pump.

Variants and Related Words

• Diffusion pumping (n): The process or action performed by a diffusion pump.
  • Diffusion pumping is effective for achieving pressures below 10^-3 Pa.
• Vapor diffusion pump: A more descriptive synonym for "diffusion pump."
• High-vacuum pump: A general category that includes diffusion pumps.

Synonyms

• Vapor pump: A synonym emphasizing the use of a vapor jet.
• High-vacuum pump: A broader term for pumps capable of creating a high vacuum.

Related Phrases

• Foreline/backing pump: A preliminary pump (like a rotary vane pump) used in conjunction with a diffusion pump to handle higher initial pressures.
  • The diffusion pump requires a backing pump to function correctly.

Noun

1. vacuum pump used to obtain a high vacuum