Pentel Ain Stein Mechanical Pencil Lead, 0.5mm HB, 40 Leads (C275-HB)

Product Information

Albert Einstein ( / ˈ aɪ n s t aɪ n/ EYEN-styne; [4] German: [ˈalbɛɐt ˈʔaɪnʃtaɪn] ⓘ; 14 March 1879– 18 April 1955) was a German-born theoretical physicist who is widely held to be one of the greatest and most influential scientists of all time. Best known for developing the theory of relativity, Einstein also made important contributions to quantum mechanics, and was thus a central figure in the revolutionary reshaping of the scientific understanding of nature that modern physics accomplished in the first decades of the twentieth century. [1] [5] His mass–energy equivalence formula E = mc 2, which arises from relativity theory, has been called "the world's most famous equation". [6] He received the 1921 Nobel Prize in Physics "for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect", [7] a pivotal step in the development of quantum theory. His work is also known for its influence on the philosophy of science. [8] [9] In a 1999 poll of 130 leading physicists worldwide by the British journal Physics World, Einstein was ranked the greatest physicist of all time. [10] His intellectual achievements and originality have made the word Einstein broadly synonymous with genius. [11] If you want an especially smooth and dark lead, we recommend B or 2B lead. It can be tempting to go all the way out to 4B, but in our experience, 4B leads are a bit too soft and prone to smudging for everyday writing. Einstein's " Zur Elektrodynamik bewegter Körper" [222] ("On the Electrodynamics of Moving Bodies") was received on 30 June 1905 and published 26 September of that same year. It reconciled conflicts between Maxwell's equations (the laws of electricity and magnetism) and the laws of Newtonian mechanics by introducing changes to the laws of mechanics. [228] Observationally, the effects of these changes are most apparent at high speeds (where objects are moving at speeds close to the speed of light). The theory developed in this paper later became known as Einstein's special theory of relativity.

Following the discovery of the recession of the galaxies by Edwin Hubble in 1929, Einstein abandoned his static model of the universe, and proposed two dynamic models of the cosmos, the Friedmann–Einstein universe of 1931 [251] [252] and the Einstein–de Sitter universe of 1932. [253] [254] In each of these models, Einstein discarded the cosmological constant, claiming that it was "in any case theoretically unsatisfactory". [251] [252] [255] Einstein, Albert (1926b). Written at Berne, Switzerland. Fürth, R. (ed.). Investigations on the Theory of the Brownian Movement (PDF). Translated by Cowper, A. D. US: Dover Publications (published 1956). ISBN 978-1-60796-285-4 . Retrieved 4 January 2015. Reconciled Maxwell's equations for electricity and magnetism with the laws of mechanics by introducing changes to mechanics, resulting from analysis based on empirical evidence that the speed of light is independent of the motion of the observer. [223] Discredited the concept of a " luminiferous ether". [224] Einstein, Albert (31 January 1918). "Über Gravitationswellen"[About gravitational waves]. Sitzungsberichte der Königlich Preussischen Akademie der Wissenschaften Berlin: 154–167. Bibcode: 1918SPAW.......154E . Retrieved 14 November 2020. Einstein never fully accepted quantum mechanics. While he recognized that it made correct predictions, he believed a more fundamental description of nature must be possible. Over the years he presented multiple arguments to this effect, but the one he preferred most dated to a debate with Bohr in 1930. Einstein suggested a thought experiment in which two objects are allowed to interact and then moved apart a great distance from each other. The quantum-mechanical description of the two objects is a mathematical entity known as a wavefunction. If the wavefunction that describes the two objects before their interaction is given, then the Schrödinger equation provides the wavefunction that describes them after their interaction. But because of what would later be called quantum entanglement, measuring one object would lead to an instantaneous change of the wavefunction describing the other object, no matter how far away it is. Moreover, the choice of which measurement to perform upon the first object would affect what wavefunction could result for the second object. Einstein reasoned that no influence could propagate from the first object to the second instantaneously fast. Indeed, he argued, physics depends on being able to tell one thing apart from another, and such instantaneous influences would call that into question. Because the true "physical condition" of the second object could not be immediately altered by an action done to the first, Einstein concluded, the wavefunction could not be that true physical condition, only an incomplete description of it. [287] [288]Pilot is another Japanese stationery giant known in the west for their pens, such as the Pilot G2 07 and the Precise V5 & V7.

The first, indirect, detection of gravitational waves came in the 1970s through observation of a pair of closely orbiting neutron stars, PSR B1913+16. [239] The explanation for the decay in their orbital period was that they were emitting gravitational waves. [239] [240] Einstein's prediction was confirmed on 11 February 2016, when researchers at LIGO published the first observation of gravitational waves, [241] detected on Earth on 14 September 2015, nearly one hundred years after the prediction. [239] [242] [243] [244] [245] Hole argument and Entwurf theory

Einstein, Albert (1905e) [Manuscript received 27 September 1905]. Written at Berne, Switzerland. Paul Karl Ludwig Drude (ed.). "Ist die Trägheit eines Körpers von seinem Energieinhalt abhängig?"[Does the Inertia of a Body Depend Upon Its Energy Content?]. Annalen der Physik. Vierte Folge (in German). Leipzig, Germany: Verlag von Johann Ambrosius Barth (published 21 November 1905). 18 (all series: 323) (13): 639–641. Bibcode: 1905AnP...323..639E. doi: 10.1002/andp.19053231314– via Wiley Online Library, Hoboken, New Jersey, US (10 March 2006). To compensate for the lead not being very strong, the lead diameter of the first mechanical pencils was around 0.9 mm.