List of days of the year

27 September - Albert Einstein's paper "Does the Inertia of a Body Depend Upon Its Energy Content?", introducing the equation E=mc² in 1905

 


The physics journal "Annalen der Physik" published Albert Einstein's groundbreaking paper titled "Ist die Trägheit eines Körpers von seinem Energieinhalt abhängig?" in 1905. The paper is more commonly known by its English translation: "Does the Inertia of a Body Depend Upon Its Energy Content?" In this paper, Albert Einstein introduced the famous equation E=mc², which is one of the most iconic equations in the field of physics.

The equation E=mc² expresses the equivalence of mass (m) and energy (E), with the constant of proportionality being the speed of light squared (c²). This equation fundamentally changed our understanding of the relationship between matter and energy, and it has had profound implications in various branches of physics, including nuclear physics and the development of atomic energy.

Einstein's work in this paper laid the foundation for the theory of special relativity, which revolutionized our understanding of space, time, and motion. It had a significant impact on the development of modern physics and led to many important discoveries and technological advancements in the 20th century.

 

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