User Tools

    To create and edit articles, please register and log-in

Main Menu

Main menu
Click categories to expand


A-Z listingplugin-autotooltip__plain plugin-autotooltip_bigA-Z listing

This is an alphabetical index of all content pages.


Other categories

Utilities

Contact
Register

Also see

Importance Ratings
News
Legal
Donate/Sponsor
Curator's rationale


Wikenigma supports:


Feeds etc
rss / xml feed
sitemap file
A-Z listing (archived)


Auto-Translate Site
Indexed under : Physics / General

Wikenigma - an Encyclopedia of Unknowns Wikenigma - an Encyclopedia of the Unknown

Sonoluminescence

Sonoluminescence is the emission of short (pico-second) of light from imploding bubbles in a liquid when excited by sound. It was discovered in 1934 during sonar experiments at the University of Cologne. Light emissions are the result of the ultra-high temperatures caused as collapsing bubbles generate an imploding shock wave that compresses and heats the gas into a plasma at the centre of the bubble.

Measurements suggest extremely high temperatures - estimated to be from 2,300 K to 20,000 K.

The mechanism of sonoluminescence is unknown - though there are several as-yet-unconfirmed theories.

The two most prominent theories are currently the Shock Wave Model and the Hot-Spot model.

[…] the shock wave model that a spherical shock wave converges at the bubble center where extremely high temperature plasma is formed. The other is the hot-spot model that nearly the whole bubble is heated by quasi-adiabatic compression, where ‘quasi-‘ means appreciable thermal conduction takes place between the heated bubble interior and the surrounding liquid.

Source : Multibubble Sonoluminescence from a Theoretical Perspective Open AccessMolecules 2021, 26(15), 4624

Technical details of other theories are described at Wikipedia

Recent (2022) research from the University of Ottawa shows the statistical analysis of the photon emissions suggests that they are due to some kind of quantum level effects - though the exact nature of the process remains unclear. See Observation of Nonclassical Photon Statistics in Single-Bubble Sonoluminescence arXiv.org, 2022

Importance Rating


    Share this page :

Dear reader : Do you have any suggestions for the site's content?

Ideas for new topics, and suggested additions / corrections for old ones, are always welcome.

If you have skills or interests in a particular field, and have suggestions for Wikenigma, get in touch !


Or, if you'd like to become a regular contributor . . . request a login password. Registered users can edit the entire content of the site, and also create new pages.

( The 'Notes for contributors' section in the main menu has further information and guidelines etc.)

Automatic Translation

You are currently viewing an auto-translated version of Wikenigma

Please be aware that no automatic translation engines are 100% accurate, and so the auto-translated content will very probably feature errors and omissions.

Nevertheless, Wikenigma hopes that the translated content will help to attract a wider global audience.

Show another (random) article

DOKUWIKI IMPLEMENTATION DESIGN BY UNIV.ORG.UK MAY 2022