ΕΙΚΟΝΑ ΔΗΜΟΚΡΙΤΟΣ

ΕΙΚΟΝΑ ΔΗΜΟΚΡΙΤΟΣ
Τηλέφωνα Επικοινωνίας: 302651044769, Κινητό: 306979670724

Παρασκευή, Νοεμβρίου 30, 2018

ΦΥΣΙΚΗ ΛΥΚΕΙΟΥ ΠΡΟΣΑΝΑΤΟΛΙΣΜΟΥ ΘΕΤΙΚΩΝ ΣΠΟΥΔΩΝ "Η ΚΑΤΑΣΤΑΤΙΚΗ ΕΞΊΣΩΣΗ ΤΩΝ ΙΔΑΝΙΚΩΝ ΑΕΡΙΩΝ"

ΦΥΣΙΚΗ  ΛΥΚΕΙΟΥ ΠΡΟΣΑΝΑΤΟΛΙΣΜΟΥ ΘΕΤΙΚΩΝ ΣΠΟΥΔΩΝ "Η ΚΑΤΑΣΤΑΤΙΚΗ ΕΞΊΣΩΣΗ ΤΩΝ ΙΔΑΝΙΚΩΝ ΑΕΡΙΩΝ"

ΓΙΑ ΝΑ ΚΑΝΕΤΕ (DOWNLOAD) KATEΒΑΣΕΤΕ ΤΟ PDF ΘΕΩΡΙΑΣ " Η ΚΑΤΑΣΤΑΤΙΚΉ ΕΞΊΣΩΣΗ ΤΩΝ ΙΔΑΝΙΚΩΝ ΑΕΡΙΩΝ" ΠΑΤΗΣΤΕ ΕΔΩ

Τρίτη, Νοεμβρίου 27, 2018

ΦΥΣΙΚΗ Β ΛΥΚΕΙΟΥ ΠΡΟΣΑΝΑΤΟΛΙΣΜΟΥ ΘΕΤΙΚΩΝ ΣΠΟΥΔΩΝ "ΟΙ ΝΟΜΟΙ ΤΩΝ ΙΔΑΝΙΚΩΝ ΑΕΡΙΩΝ" ΕΠΑΝΑΛΗΨΗ ΘΕΩΡΙΑΣ

ΦΥΣΙΚΗ Β ΛΥΚΕΙΟΥ ΠΡΟΣΑΝΑΤΟΛΙΣΜΟΥ ΘΕΤΙΚΩΝ ΣΠΟΥΔΩΝ "ΟΙ ΝΟΜΟΙ ΤΩΝ ΙΔΑΝΙΚΩΝ ΑΕΡΙΩΝ" ΕΠΑΝΑΛΗΨΗ ΘΕΩΡΙΑΣ

ΓΙΑ ΝΑ ΚΑΤΕΒΑΣΕΤΕ (DOWNLOAD) ΤΟ ΑΡΧΕΙΟ PDF ΤΗΣ ΘΕΩΡΙΑΣ ΤΩΝ ΝΟΜΩΝ ΤΩΝ ΙΔΑΝΙΚΩΝ ΑΕΡΊΩΝ" ΠΑΤΗΣΤΕ ΕΔΩ

Κυριακή, Νοεμβρίου 04, 2018

SI gets a makeover

SI gets a makeover

03 Nov 2018
Taken from the November 2018 issue of Physics World. Members of the Institute of Physics can enjoy the full issue via the Physics World app.


An upcoming change to SI units – due to be officially approved this month – will mark the end of a long journey from defining quantities in terms of objects to using precise, unchanging and universal constants of nature. Benjamin Skuse tells the story




On the outskirts of Paris, eight metres below ground in a climate-controlled vault, sits a 143-year-old platinum alloy cylinder. Standing just 39 mm tall, it has never been touched by human hands. Like a delicate Russian doll, the cylinder is caged inside three nested glass bells in a room that can be accessed only with three keys kept by three different people. Surrounding the mysterious object are “the witnesses”: six “identical” cylinders cast from the same platinum alloy.

Though preservation efforts rival those of the Turin Shroud, the cylinder is not a sacred religious object. It is the International Prototype Kilogram (IPK), the one and only true kilogram against which all others are measured. Housed in the Pavillon de Breteuil – home to the International Bureau of Weights and Measures (BIPM) – the IPK will soon lose its unique status and become a relic of a bygone age. It will then be as quaint as the International Prototype Metre (IPM) – a platinum alloy bar also housed at the BIPM – that served as the world’s official metre until 1960.

Σάββατο, Νοεμβρίου 03, 2018