Fundamental constants

Vacuum permittivity

Vacuum permittivity, commonly denoted ε0 (pronounced "epsilon nought" or "epsilon zero"), is the value of the absolute dielectric permittivity of classical vacuum. It may also be referred to as the permittivity of free space, the electric constant, or the distributed capacitance of the vacuum. It is an ideal (baseline) physical constant. Its CODATA value is: ε0 = 8.8541878128(13)×10−12 F⋅m−1 (farads per meter), with a relative uncertainty of 1.5×10−10. It is a measure of how dense of an electric field is "permitted" to form in response to electric charges, and relates the units for electric charge to such as length and force. For example, the force between two separated electric charges with spherical symmetry (in the vacuum of classical electromagnetism) is given by Coulomb's law: Here, q1 and q2 are the charges, r is the distance between their centres, and the value of the constant fraction (known as the Coulomb constant, ke) is approximately 9 × 109 N⋅m2⋅C−2. Likewise, ε0 appears in Maxwell's equations, which describe the properties of electric and magnetic fields and electromagnetic radiation, and relate them to their sources. In electrical engineering, ε0 itself is used as a unit to quantify the permittivity of various dielectric materials. (Wikipedia).

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How to Make a Vacuum Pump

This video will show how to make a vacuum pump, a device that can be used to suck the air out of sealed environments. This is the same pump I use to operate my vacuum cannon seen here: http://youtu.be/CVL99yIB3NQ A clear vacuum chamber such as the one seen in the video can be obtained by

From playlist Practical Projects & Skills

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Steam Vacuum - Making/How it Works

A steam vacuum is a vacuum that's create by making steam in a container (I use a microwave and a kettle) and then rapidly cooling it back to water (condensing it), leaving behind a vacuum. This vacuum is a low pressure are that dramatically sucks in more water and, if in a flexible contain

From playlist Science Projects

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How to Make a Vacuum Cannon

To learn how I made the vacuum pump used to operate this cannon, take a look at this video: http://youtu.be/UkPLu6mgdWA A vacuum cannon is an interesting physics demonstration that shows how much atmospheric pressure there is at the earths surface, though we do not feel it because our bod

From playlist Science & Experiments

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More on Vacuums - Sixty Symbols

We let the particle physics people give their version of what a vacuum is like. More physics at http://www.sixtysymbols.com/ Tony Padilla and Ed Copeland.

From playlist Ed Copeland - Sixty Symbols

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How a Crookes radiometer works

A Crookes radiometer is driven by a thermal gas effect, and not "light pressure" as often thought. I demonstrate the radiometer in a vacuum chamber and explain its optimal running pressure. http://en.wikipedia.org/wiki/Crookes_radiometer

From playlist Optics

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How Does this Vacuum Create Hurricane Force Winds?

This vacuum's motor produces a constant 100 MPH stream of air. How does it keep from overheating? MACHINES: HOW THEY WORK http://www.sciencechannel.com/tv-shows/machines-how-they-work/ Subscribe to Science Channel: http://bit.ly/SubscribeScience Facebook: https://www.faceb

From playlist Machines: How They Work

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7 Amazing Physics Tricks with Vacuum pump That You Must see!!!

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From playlist physics

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Drag Force!! (Physics)

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From playlist General Mechanics

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Parallel Plate Capacitors

We derive the equation for the capacitance of a parallel plate capacitor. Learn how adding a dielectric material to a capacitor affects its capacitance and discover the definition of the dielectric constant. Want Lecture Notes? http://www.flippingphysics.com/parallel-plate-capacitors.html

From playlist All of AP Physics C: Electricity & Magnetism!

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Capacitors - Review for AP Physics C: Electricity and Magnetism

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From playlist AP Physics C: Electricity & Magnetism Review

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Mod-07 Lec-17 Electrical Phenomenon in Insulators

Advanced ceramics for strategic applications by Prof. H.S. Maiti,Department of Metallurgy and Material Science,IIT Kharagpur.For more details on NPTEL visit http://nptel.ac.in

From playlist IIT Kharagpur: Advanced Ceramics for Strategic Applications | CosmoLearning.org Materials Science

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Electric Permittivity

019 - Electric Permittivity In this video Paul Andersen explains how electric permittivity of a material resists the formation of electric fields. Capacitors store energy be preventing the formation of electric fields in dielectric material. The electric permittivity of free space is co

From playlist AP Physics 2 Videos

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JEE Main Physics E & M #21 Speed of an E & M Wave in a Dielectric Medium

Visit http://ilectureonline.com for more math and science lectures! To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 An electromagnetic wave of frequency 3GHz enters a dielectric medium of relative electric permittivity 2.25 from vacuum. The waveleng

From playlist JEE (MAIN) PHYSICS E&M ELECTRICITY AND MAGNETISM

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From playlist Level 3 NCEA Physics

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Schottky Diode Part 2 - Depletion Region and Capacitance

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From playlist Electronics I: Semiconductor Physics and Devices

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The Biggest Clue that the Speed of Light Is Constant | Relativity and Electromagnetism (Parth G)

The Special and General Theories of Relativity both work on the assumption that the speed of light is constant for all (inertial) observers. But why? Hey everyone, let's talk about an important axiom in Einstein's theories of relativity: the speed of light being constant. This assumption

From playlist Relativity by Parth G

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Astronomy - Ch. 31: What is Space Made of? (7 of 15) Analogy of Waves on a String

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From playlist ASTRONOMY 31 WHAT IS SPACE MADE OF?

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AWESOME SUPERCONDUCTOR LEVITATION!!!

A quantum levitator it's a circular track of magnets above which a razor-thin disc magically levitates, seeming to defy the laws of physics. The key to the levitator is the disc, which is made of superconducting material sandwiched between layers of gold and sapphire crystal. A piece of fo

From playlist THERMODYNAMICS

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Maxwell’s Equations Part 1: Gauss’s Law for the Electric Field

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From playlist Classical Physics

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AWESOME DEMONSTRATION FORCE OF ATMOSPHERIC PRESSURE!!!

In this video i show the force of atmospheric air in a syringe with coloured water under specific conditions in vacuum chamber! During the experiment i explain the phenomena. Amazing demonstration with amazing results!

From playlist PRESSURE

Related pages

Volt | Planck constant | Coulomb | Statcoulomb | Electronvolt | Henry (unit) | Maxwell's equations | Second | Electric charge | Fine-structure constant | Electromagnetic wave equation | Vacuum permeability | Coulomb constant | Physical constant | Ampere | Kilogram | SI base unit | Farad | Elementary charge | Newton (unit) | Speed of light