Why is Joseph Black important in the history of chemistry?

Joseph Black is a pivotal figure in the history of chemistry, primarily for his pioneering work in pneumatic chemistry and his quantitative approach to experimental science.12

His most significant contributions include:

• Discovery of "Fixed Air": Black demonstrated that the gas evolved during the heating of magnesium carbonate and calcium carbonate (chalk) was chemically distinct from atmospheric air. He termed this gas "fixed air," which is now known as carbon dioxide. This discovery was revolutionary because it proved that gases could be distinct chemical substances rather than merely modified forms of common air.231
• Quantitative Methodology: Black was one of the first chemists to use a balance throughout a planned, cyclic series of experiments, establishing a rigorous, quantitative foundation for chemical research.2
• Concept of Latent Heat: Beyond chemistry, Black made fundamental contributions to physics by identifying latent heat. He realized that heat absorbed during phase changes—such as melting ice or boiling water—does not increase the temperature, a concept that proved essential for the development of the steam engine by his friend James Watt.4

His work inspired a generation of scientists to characterize various other gases, effectively launching the rapid advancement of chemistry in the late 18th century.2