Working during the time just after Paracelsus and iatrochemistry, Jan Baptist van Helmont suggested that there are insubstantial substances other than air and coined a name for them - "gas", from the Greek word chaos.
Tidak lama berselang setelah Paracelsus dan iatrokimia, Jan Baptist van Helmont menyarankan bahwa ada zat substansial selain udara dan menamainya - "gas", dari kata Yunani chaos.