FTP, name this scientist, who also proposed the laws of thermal expansion of gases, the law of simple multiple proportion  s, and the law of partial pressures, an early advocate of atomic theory.
His lying in state at the Manchester Town Hall in 1844 was attended by over 40,000 people. In his most important book, A New System of Chemical Philosophy, he proposed that relative atomic weights could be discovered by assuming that, when only one  compound of two elements exists, it would have the simplest possible formula, and the unit of relative atomic mass is named for him. FTP, name this scientist, who also proposed the laws of thermal expansion of gases, the law of simple multiple proportion  s, and the law of partial pressures, an early advocate of atomic theory.
His lying in state at the Manchester Town Hall in 1844 was attended by over 40,000 people.
John Dalton