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Significant Scots
Hannay, James Ballantyne

James Ballantyne Hannay (1855-1890), a self-made scientist and skilful experimenter, discovered that supercritical fluids dissolve solids, studied the influence of pressure and temperature, and thus set the stage for the development of the powerful analytical and separation technique of supercritical gas extraction. He proved that the critical state is not the solution of one phase in the other, but the gas and liquid phases become one, having uniform properties throughout. He invented the time method technique that allows determining the existence and nature of hydrates in simple and complex salts. He was the first to prepare artificial diamonds and studied the toasting of pyrite and how to manufacture lead, its oxides and salts in a state of high purity.

Read more about him here (pdf)

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