What is picofarad per meter (pF/m)? - Definition from WhatIs.com

Definition

picofarad per meter (pF/m)

Part of the Smart grid glossary:

The picofarad per meter (symbolized pF/m) is a unit of electric permittivity , a constant of proportionality that exists between electric displacement and electric field intensity.

Permittivity is a characteristic of matter , and is important in the design and construction of capacitor s and radio-frequency ( RF ) transmission lines. The permittivity of a vacuum (also known as free space) is equal to approximately 8.85 pF/m.

Relative permittivity can be expressed as the ratio of the number of picofarads per meter in a particular substance to 8.85 pF/m. This ratio is called the dielectric constant of a material. Free space has a dielectric constant of 1, and most substances have a dielectric constant greater than this.

Also see capacitance , permittivity , SI , and Table of Physical Units and Constants.

This was last updated in March 2011
Posted by: Margaret Rouse

Related Terms

Definitions

  • WRAN (wireless regional area network)

    - A wireless regional area network (WRAN) is techology based on IEEE 802.22 to take advantage of underused white space spectrum and bring high-speed wireless connectivity to rural areas. (WhatIs.com)

  • event-condition-action rule (ECA rule)

    - An event condition action rule (ECA rule) is the underlying model for event-driven programming, in which actions are triggered by events, given the existence of specific conditions. (WhatIs.com)

  • FBI Alert Number I-091015-PSA

    - FBI Alert Number I-091015-PSA is a public service announcement from the United States Federal Bureau of Investigation to inform individuals and organizations about the importance of Internet of Thi... (WhatIs.com)

Glossaries

  • Smart grid

    - Terms related to smart grids, including definitions about utility electricity delivery systems and words and phrases about smart meters and distributing, monitoring and billing electrical power.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question About picofarad per meter (pF/m)Powered by ITKnowledgeExchange.com

Get answers from your peers on your most technical challenges

Tech TalkComment

Share
Comments

    Results

    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.