Albert Einstein in Palm Springs, California circa 1930. Photograph by William H. Smith.

The First Time Einstein Wrote E = mc²

The monumental implications of world’s most famous equation

Sunny Labh
3 min readApr 2, 2023

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If you ask a physicist, or any science student, or even anyone from a non-scientific background about the most famous equation in Physics, pretty much everybody will undoubtedly say Einstein’s mass-energy relation. Before Einstein, there were some other scientists who had proposed equations relating mass and energy, but none of them were as groundbreaking or accurate as Einstein’s famous equation, E=mc². One such equation was the Balmer series proposed by Johann Balmer in 1875, which related the spectral lines of hydrogen atoms to a constant related to the atom’s mass and energy.

Another equation was proposed by Henri Poincaré in 1900, which related electromagnetic radiation to mass and was expressed as E=3/8mc². However, Poincaré’s equation did not receive the same level of recognition or acceptance as Einstein’s equation. So, while there were some earlier attempts to relate mass and energy, it was Einstein’s equation that truly revolutionized our understanding of the relationship between the two.

The famous equation E=mc² was first introduced by Albert Einstein in a scientific paper titled “Ist die Trägheit eines Körpers von seinem Energieinhalt abhängig?”, which was published in the German scientific journal Annalen der Physik on September 27, 1905. This paper is now known as Einstein’s “miracle year” paper, as it included several groundbreaking theories that fundamentally transformed our understanding of physics, including the theory of special relativity and the relationship between energy and mass described by E=mc².

The first time Einstein scribbled the famous equation in his own handwriting. Image: Einstein Archives

The equation has been a game-changer in science, technology, and military affairs ever since it has been discovered. It reveals a fundamental insight into the nature of the universe. It means that mass and energy are different forms of the same thing and can be transformed from one to another. This equation offers a profound challenge to our intuition, as it implies that what we think of as solid matter is merely an illusion of our senses, and the underlying reality is far stranger than we could have ever imagined.The implications of E=mc² are staggering, as it holds the key to unlocking the tremendous power of the atom. It underpins the principle of nuclear energy and the development of nuclear weapons, which has transformed our global politics and led to unprecedented destruction. It is also the basis for new technologies that have reshaped our world, such as particle accelerators, which allow us to probe the subatomic realm and explore the fundamental structure of matter and the universe.

This one inch equation single handedly represents a scientific and philosophical revolution, challenging our assumptions about the nature of reality, the limits of technology, and the consequences of human action. It raises profound questions about the ethics of scientific research and the responsibility of scientists and policymakers to manage the power and consequences of scientific discoveries.

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Sunny Labh
Sunny Labh

Written by Sunny Labh

Science writer and communicator majoring in Quantum Mechanics. Curator of @PhysInHistory on twitter. Twitter: @thePiggsBoson

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