1722 in science

• René Antoine Ferchault de Réaumur publishes his work on metallurgy, L'Art de convertir le fer forge en acier, which describes how to convert iron into steel.

• April 5 (Easter Sunday) – Jacob Roggeveen lands on Easter Island.

• Abraham de Moivre states de Moivre's formula, connecting complex numbers and trigonometry.

• A continuous series of weather records is begun in Uppsala by Anders Celsius; it will be maintained for at least 300 years.

• Willem 's Gravesande publishes experimental evidence that the formula for kinetic energy of a body in motion is $E\_k\; \backslash propto\; \backslash begin\{matrix\}\; \backslash end\{matrix\}\; mv^2$.

• October – In clockmaking, George Graham demonstrates that his experiments, begun in December 1721, with mercurial compensation of the pendulum result in greater accuracy in timekeeping under conditions of variable temperature.{{cite book|last=Britten|first=F. J.|title=Former Clock & Watchmakers and their Work|year=1894|publisher=E. & F.N. Spon|location=London|url=https://archive.org/details/formerclockwatc00britgoog|pages=[https://archive.org/details/formerclockwatc00britgoog/page/n404 89]–97}}

• May 11 – Petrus Camper, Dutch comparative anatomist (died 1789)
• November 19 – Leopold Auenbrugger, Austrian physician (died 1809)
• December 28 – Eliza Lucas, American agronomist (died 1793)
• Thomas Barker, English meteorologist (died 1809)

• May 20 – Sébastien Vaillant, French botanist (born 1669)

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Category:18th century in science

Category:1720s in science