1. Torsion balance: Cavendish's most famous invention is the torsion balance, an instrument that measures very small forces. He used this instrument to measure the force of gravity between two balls, and from this he calculated the density of the Earth.

2. Electrical condenser: Cavendish also invented the electrical condenser, a device that stores electrical charge.

3. Reflecting telescope: He also improved the reflecting telescope, making it more powerful and easier to use.

4. Spirit level: He also invented the spirit level, a device used to determine whether a surface is horizontal.

5. Hydrogen production: Cavendish discovered and described hydrogen gas, which he referred to as "inflammable air."

6. Carbon Dioxide detection: Cavendish was the first to recognize that adding sulfuric or nitric acid to chalk (Calcium Carbonate) would produce a large amount of gas, which we know today as carbon dioxide.