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  • Jacques was a chemist, physicist, and aeronaut.

  • He had several inventions including a hydrometer and reflecting goniometer

  • He also improved the Gravesand heliostat and Fahrenheit's aerometer

  • In 1783, realizing that hydrogen was lighter than air, Casar created the first hydrogen balloon and it made its first flight on August 27, 1783; when the balloon landed outside of Paris it was actually destroyed by peasants who were scared because they didn't know what was going on.

  • Then on December 1, 1783, Jacques, along with his co-pilot Nicolas-Louis Robert, ascended to the height of 1,800 feet 

  • The name of the newly constructed balloon in which they made this flight was the La Charlière

  • What Jacques Alexandre-Casar was also know for was the creation of Charles's law in 1787

  • This is one of the basic gas laws and it states that "at constant pressure, the volume occupied by a fixed weight of gas is directly proportional to the absolute temperature"

  •  In 1793, Jacques Alexandre-Casar was elected to the Académie des Sciences and then became professor of physics at the Conservatoire des Arts et Métiers