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[[Category:Alchemical substances]] ...

...}) – in which case Van Helmont simply was following the established [[alchemical]] usage first attested in the works of [[Paracelsus]]. According to Paracel ...particles'' in the system. However, in '''''real gases''''' and other real substances, the motions which define the kinetic energy of a system (which collectivel ...

...ieval writings are both accurate and vivid, and they provide long lists of substances used in the treatment of headaches. Many of the approaches of physicians in ...|synthetic]] ammonium chloride as produced from [[Organic compound|organic substances]], and so the addition of sal ammoniac to the list of 'spirits' is likely a ...

...esses.<ref>{{Cite book|title=Women in chemistry: their changing roles from alchemical times to the mid-twentieth century|last=F.|first=Rayner-Canham, Marelene|da ...Bronx]], New York. This technique is used to accurately measure levels of substances such as hormones which are found in small concentrations in the body.<ref>{ ...