general and specific gravitation

General gravitation, or gravity, is a fundamental force describing how masses attract each other. It governs the motion of planets, stars, and galaxies, and is described by Einstein's theory as the curvature of spacetime caused by mass and energy. Specific gravitation, often called specific gravity, compares the density of a substance to that of water. It’s a ratio that helps identify materials or determine whether an object will float or sink, with no units involved. While general gravitation explains large-scale phenomena, specific gravity is mainly used in material and engineering contexts.