At present, the kelvin is literally based on no more than water—on the triple point of water, to be more precise. The base unit of temperature is therefore dependent on a material whose properties may vary. But this is ...
General Physics
Apr 5, 2017
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By 2018, scientists want all physical base units to be based on solid, unchangeable fundamental constants. The units "meter" and "second" are well ahead of schedule; the kelvin, the kilogram, the mole and the ampere are next ...
General Physics
Nov 29, 2016
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Fundamental constants are physical quantities that are universal in nature. For example, the speed of light in vacuum and the charge of a single electron are the same everywhere in the universe. That is why scientists would ...
General Physics
Nov 28, 2016
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The fundamental constants that govern the laws of nature are being determined with increasing accuracy, according to a review paper published this week in Journal of Physical and Chemical Reference Data.
General Physics
Jul 14, 2015
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Are the fundamental constants really constant? Recent investigations carried out at the Physikalisch-Technische Bundesanstalt (PTB) have shown that one essential fundamental constant – namely the mass ratio of protons to ...
General Physics
Nov 18, 2014
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NIST has taken part in a new push to address a persistent and growing problem in physics: the value of G. The Newtonian constant of gravitation, used to calculate the attractive force of gravity between objects, is more than ...
General Physics
Oct 28, 2014
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(Phys.org)—An optical clock with neutral strontium atoms is considered one of the top candidates for the definition of a "new" second. The probabilities have increased considerably, since its frequency will now be determined ...
General Physics
Jan 9, 2013
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New research from NPL's Quantum Detection Group presents the most precise measurements of the quantum Hall effect ever made, using the two-dimensional material graphene.
Quantum Physics
Sep 19, 2011
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The UK's National Physical Laboratory (NPL) has released its first app for iOS devices such as iPhones and iPads. It will provide researchers with easy and up-to-date access to the values for all the physical constants.
General Physics
Nov 17, 2010
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The University of Queensland (UQ) physicists are on a quest to build the world's most accurate thermometer.
General Physics
Oct 11, 2012
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