The scale of a Mohr pipette is divided into units of one and one-tenth of a milliliter. It is less precise than a volumetric pipette due to its wide neck. When taking a large number of solutions where precision is not a high priority, they are used. They can release liquid gradually ...
of Glasgowin 1748. Cullen letethyl etherboil into a partial vacuum; he did not, however, use the result to any practical purpose. In 1805 an American inventor,Oliver Evans, designed the first refrigeration machine that used vapour instead of liquid. Evans never constructed his machine, but ...
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