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The Physikalisch-Technische Bundesanstalt (PTB) is the national metrology institute of the Federal Republic of Germany, with scientific and technical service tasks.It is a higher federal authority and a public-law institution directly under federal government control, without legal capacity, under the auspices of the Federal Ministry for Economic Affairs and Climate Action.
Although Boltzmann first linked entropy and probability in 1877, the relation was never expressed with a specific constant until Max Planck first introduced k, and gave a more precise value for it (1.346 × 10 −23 J/K, about 2.5% lower than today's figure), in his derivation of the law of black-body radiation in 1900–1901. [11]
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Lectures on Theoretical Physics is a six-volume series of physics textbooks translated from Arnold Sommerfeld's classic German texts Vorlesungen über Theoretische Physik. The series includes the volumes Mechanics , Mechanics of Deformable Bodies , Electrodynamics , Optics , Thermodynamics and Statistical Mechanics , and Partial Differential ...
Keira Knightley’s number one reason for having no more kids isn’t the pain of childbirth or the endless nights of disrupted sleep.. On Monday, Dec. 9. the actress, 39, gushed about her two ...
Standard Model of Particle Physics. The diagram shows the elementary particles of the Standard Model (the Higgs boson, the three generations of quarks and leptons, and the gauge bosons), including their names, masses, spins, charges, chiralities, and interactions with the strong, weak and electromagnetic forces.
Dec. 11: A New Jersey closed-door briefing about the drones is held at state police headquarters, where lawmakers are told that investigators have been unable to electronically detect the drones ...
On Wednesday, Chewy Inc. (NYSE:CHWY) reported a third-quarter adjusted EPS of $0.20, up 33.3% year-over-year, compared to the consensus of $0.08. The retailer of pet supplies reported sales of $2. ...