The law of buoyancy refers to Archimedes principle. Archimedes principle is a basic principle of buoyancy in physics. The specific content is that an object immersed in liquid or gas is subjected to buoyancy in the vertical direction, and the buoyancy is equal to the weight of the liquid or gas displaced by the object.

Archimedes principle formula

Buoyancy is the net effect of all the effects of fluid pressure on objects. An object immersed in a static fluid (gas or liquid) is subjected to buoyancy, the magnitude of which is equal to the weight of the fluid displaced by the object, and the direction is vertical upward and passes through the center of mass of the displaced fluid.

Mathematical expression F float =G row =m row g=ρ liquid (gas) gV row. Units f float-Newton (n), ρ liquid (gas) -kg/m 3, g-n/kg, v row -m 3. Factors related to buoyancy buoyancy is only related to ρ liquid and V row, not to ρ object (G object) and depth, and not directly related to V object.

When the object is completely immersed in liquid or gas, row V =V object; when the object is only partially immersed in liquid, row V < V; applicable scope: liquid and gas. According to the cause of buoyancy-pressure difference between upper and lower surfaces p=ρ liquid g(h 1-H2)F floating =F upward -F downward = ρ liquid g(h 1-h2)S=ρ liquid gV row.