This Day in Science History - March 15 - Josef Loschmidt
March 15th is Josef Loschmidt's birthday. Loschmidt was an
Austrian chemist who is best known for his close estimation of the size
of air molecules. His value was nearly twice the actual size, but the
correct order of magnitude. He also is known for the Loschmidt constant
which sets the number of particles in a given volume of an idea gas as a
constant. This value of 2.687 x 1025 particles per cubic meter at STP is occasionally confused with Avogadro's number in textbooks.
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