5th June :The Day of Bose–Einstein Condensate

stamps physicsA Bose–Einstein condensate (BEC) is a  state of matter of a dilute gas of bosons   cooled to temperature very close to  absolute zero (that is, very near 0 K or −273.15 °C). Under such conditions, a large fraction of bosons occupy the lowest quantum state, at which point macroscopic quantum phenomena   become apparent. A BEC is formed by cooling a gas of extremely low density, about one-hundred-thousandth the density of normal air, to ultra-low temperatures. Due to the unique properties of the condensate Lene Hau ,  showed that light can either be stopped or slowed down significantly to the velocity of 17 meters per second, resulting in an extremely high refractive index.

This state was first predicted, generally, in 1924–25 by Satyendra Nath Bose   and  Albert Einstein. On June 5, 1995 the first gaseous condensate was produced by Eric Cornell and  Carl Wieman at the University of Colorado   lab, in a gas of rubidium   atoms cooled to 170  nanokelvins (nK). Shortly thereafter,  Wolfgang Ketterle at MIT demonstrated important BEC properties. For their achievements Cornell, Wieman, and Ketterle received the 2001 Nobel Prize in Physics  .Many isotopes were soon condensed, then molecules, quasi-particles, and photons in 2010

Related Posts with Thumbnails
This entry was posted in Articles, Asian Philately, Commemorative Stamps, Themes and tagged , , , , , , , , , , , . Bookmark the permalink.

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>