Jan Baptista van Helmont
Jan Baptista van Helmont (1579 - 1644) was a Belgian noble who introduced the term gas. He published Ortus Medicinae (Origin of Medicine) and postulates the presence of carbon dioxide in the air. CITATION REQUIRED Most important, he was the first to demonstrate the law of conservation of mass.
Alternative given names are given as Jean-Baptiste van Helmont, Johannes Baptista van Helmont, Johann Baptista von Helmont, and Joan Baptista van Helmont, as well as with minor variants alternatively switching 'von' for 'van'.
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