Answer-What discovery did Henry Cavendish report in 1798?

Sol. Henry Cavendish measured the value of the gravitational constant in 1798. His experiment provided insights into Earths mass and density and confirmed Newtons law of gravitation. Information Booster The main instrument used in Cavendishs experiment was a torsion balance. He measured the gravitational force. This experiment also estimated Earths density. Cavendishs contribution was revolutionary for physics and astronomy. It became the foundation for modern gravitational studies. --- Mass-energy equivalence Proposed by Albert Einstein. Radioactivity Pioneered by Marie Curie. Conservation of energy A key principle of thermodynamics.