What is permittivity of free space? - Definition from WhatIs.com

Definition

permittivity of free space

Part of the Electronics glossary:

The permittivity of free space (a vacuum) is a physical constant equal to approximately 8.85 x 10-12 farad per meter (F/m). It is symbolized o. In general, permittivity is symbolized and is a constant of proportionality that exists between electric displacement and electric field intensity in a given medium. In many materials, particularly glass and certain plastics, is substantially greater than o.

If o represents the permittivity of free space (that is, 8.85 x 10-12 F/m) and s represents the permittivity of a particular substance (also specified in farads per meter), then the relative permittivity, also called the dielectric constant r, of that particular substance is given by:

r = s / o
= s x 1.13 x 1011

Also see Table of Physical Units and Constants.

This was last updated in September 2005
Posted by: Margaret Rouse

Related Terms

Definitions

  • modulation

    - Modulation is the process of adding information to a steady waveform or to an electronic or optical carrier signal, usually applied to electromagnetic signals. (SearchNetworking.com)

  • resistance

    - Resistance is the opposition that a substance offers to the flow of electric current; the term contrasts with conductance, which is a measure of the ease with which current flows through a substance. (WhatIs.com)

  • electric field strength

    - Electric field strength is a quantitative expression of the intensity of an electric field at a particular location. (WhatIs.com)

Glossaries

  • Electronics

    - Terms related to electronics, including definitions about electrical components and words and phrases about computers, laptops parts, digital cameras, televisions and home appliances.

  • 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 permittivity of free spacePowered 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.