Standard kilogram block

Iridium is the most corrosion-resistant metal known, and was used in making the standard meter bar of Paris, which was a 90% platinum-10% iridium alloy. This is now obsolete as is also the old Pt-Ir kilogram block. Length and mass definitions are now based on fundamental physical constants. 

Indeed, flow processes are already combined with functionalized solid phases, with ionic liquids, supercritical fluids such as carbon dioxide, and microwave irradiation. Nevertheless, numerous examples of above mentioned processes with standard and more and less innovative laboratory equipment take advantage of this new approach. Whatever chemists and chemical engineers require - synthesis of few milligrams of compounds in drug chemistry, synthesis of building blocks on a multigram scale for parallel synthesis, or even the kilogram production of fine chemicals - flow processes are a helpful tool and a crucial link between differently scaled reactions. 

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