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Henry Cavendish (October 10, 1731 - February 24, 1810) was a British scientist.
The grandson of the Second Duke of Devonshire, he attended Cambridge from 1749 to 1753 but left without taking a degree. He inherited a large fortune which enabled him to pursue his scientific studies, most of which remained unpublished during his lifetime.
He is generally credited with having discovered hydrogen, since he had described the density of 'inflammable air', which formed water on combustion, in a paper "On Factitious Airs" that appeared in 1766. Antoine Lavoisier later reproduced his experiment and gave the element its name.
Cavendish is also credited with one of the earliest accurate calculations of the mass of the earth. He used a torsion balance to measure the gravitational attraction between lead spheres in 1798, from which he calculated Newton's gravitational constant, G, which he used to calculate the earth's mass. His results remained the accepted standard until the 20th century.
He was silent and solitary, viewed as somewhat eccentric, and formed no close personal relationships outside his family. By one account, Cavendish had a back staircase added to his house in order to avoid encountering his housekeeper. The contemporary accounts of his personality have led modern commentators to speculate that he had Asperger's syndrome.
He left a large estate on his death which was used to endow the Cavendish Laboratory at Cambridge University in 1871.
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