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Max Planck (1858-1947) was a German physicist known for his foundational work on quantum theory. In 1900 he presented his theory of blackbody radiation, which introduced the idea that electromagnetic radiation is comprised of individual energy quanta, what are now commonly referred to as photons. This work led to Planck's winning the 1918 Nobel Prize in Physics.
Planck's constant is a fundamental physical constant named after Max Planck.
So-called Planck units are obtained by combining fundamental physical constants in combinations that produce quantities with various dimensions such as length, time, and mass.