Leo Graetz

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Leo Graetz

Leo Graetz (September 26, 1856 – November 12, 1941) was a German

Germany

Germany , officially the Federal Republic of Germany , is a country in Central Europe. It is bordered to the north by the North Sea, Denmark, and the Baltic Sea; to the east by Poland and the Czech Republic; to the south by Austria and Switzerland; and to the west by France, Luxembourg, Belgium, and the Netherlands....
physicist

Physicist

A physicist is a scientist who studies or practices physics. Physicists study a wide range of physical phenomena in many Physics#Major fields of physics spanning all length scales: from atom particles of which all ordinary matter is made to the behavior of the material Universe as a whole ....
. He was born in Breslau (Wroclaw)

Wroclaw

Wroclaw is the chief city of the historical region of Lower Silesia in south-western Poland, situated on the Oder River river. Over the centuries the city has been part of Kingdom of Poland , Bohemia, Austria, Prussia, and Germany....
, Poland

Poland

Poland , officially the Republic of Poland , is a country in Central Europe. Poland is bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine, Belarus and Lithuania to the east; and the Baltic Sea and Kaliningrad Oblast, a Russian Enclave and exclave, to the north....
as the son of the historian Heinrich Graetz

Heinrich Graetz

Heinrich Graetz was amongst the first historians to write a comprehensive history of the Jewish people from a Jewish perspective.Born Tzvi Hirsh Graetz to a butcher family in Ksiaz-Wielkopolski in Germany , he obtained his doctorate from the University of Jena....
.

Graetz was one of the first to investigate the propagation of electromagnetic energy

Electromagnetic radiation

Electromagnetic radiation takes the form of wave propagation waves in a vacuum or in matter. EM radiation has an electric field and magnetic field component which oscillate in phase perpendicular to each other and to the direction of energy Wave propagation....
. The Graetz number

Graetz number

In fluid dynamics, the Graetz number is a dimensionless number that characterises laminar flow in a conduit. The number is defined as:where...
(Gz), a dimensionless number describing heat flow

Heat transfer

Heat transfer is the transition of thermal energy or simply heat from a hotter object to a cooler object . When an object or fluid is at a different temperature than its thermodynamic system or another object, transfer of thermal energy, also known as heat transfer, or heat exchange, occurs in such a way that the body and the surround...
, is named after him, as is the diode bridge

Diode bridge

A diode bridge or bridge rectifier is an arrangement of four diode in a bridge circuit configuration that provides the same Polarity of output volt for either polarity of input voltage....
rectifier circuit he invented.

In 1880 he confirmed the Stefan–Boltzmann law.

Graetz died in Munich

Munich

Munich is the capital city of Bavaria, Germany. Munich is located on the River Isar north of the Northern Limestone Alps. Munich is the third largest city in Germany, after Berlin and Hamburg....
at age 85.

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