1. 1766 British chemist Henry Cavendish determines the specific weight of hydrogen gas.

2. The experiment was performed in 1797–98 by the English scientist Henry Cavendish to measure Earth’s density.

3. 1766 Henry Cavendish discovers hydrogen as a colorless, odourless gas that burns and can form an explosive mixture with air.

4. Henry Cavendish, (born October 10, 1731, Nice, France—died February 24, 1810, London, England), natural philosopher, the greatest experimental and theoretical English chemist and physicist of his age.

5. A more accurate measurement of the mean density of the Earth was made 24 years after Schiehallion, when in 1798 Henry Cavendish used an exquisitely sensitive torsion balance to measure the attraction between large masses of lead.