That number is Avogadro’s number, or Avogadro’s constant.

But the company went bankrupt.

Johann Josef Loschmidt

In 1856, Loschmidt became a high-school teacher in Vienna.

Article image

During his free time, Loschmidt conducted experiments in a small laboratory that the school allowed him to keep.

Figures of molecular structure, as they appeared in Loschmidts 1861 booklet Chemische Studien I.

Photo: Alfred Bader

In this same book, Loschmidt discussed benzene, a compound that baffled scientists.

Johann Josef Loschmidt

Loschmidt was the first who saw that the atoms had to be arranged in a ring.

Unfortunately, Loschmidt got the arrangement wrong, which was corrected by German chemist August Kekule four years later.

Kekule insisted that the structure came to him in a dream.

Loschmidt’s 1861 booklet “Chemische Studien

Kekule received all the glory while Loschmidts contribution was pretty much forgotten.

Today, he is regarded as the principal founder of the theory of chemical structure.

Proposed structure of benzene.

Proposed structure of benzene.

The correct one is right-bottom.

Image :Ju/Wikimedia Commons

A great puzzle of the time was the size of molecules.

That number is now known as Loschmidt constant.

Article image

Thanks to Loschmidts work, other scientists were able to prove Avogadros hypothesis.

Lorenzo Romano Amedeo Carlo Avogadro

Loschmidt also contributed to Maxwell’s and Boltzman’s work on thermodynamics.