What will you learn All fluids exert a force that is upward on object on the fluid. The weight of the fluid displaced by the object is equal to the buoyant force on an object. The measurement of mass and volume can be calculated by volume. To change the over all density of an object an object must have a change in shape, volume, mass. Buoyant force and fluid pressure buoyant force is when all fluid pressure exert on a upward force. The upward force that keeps an object floating on a object is called buoyant force . Difference in fluid pressure can cause buoyant Buoyant force and fluid pressure continued Archimedes was a Greek mathematical who discovered how to find buoyant force. Archimedes stated that the the buoyant force on an object in a fluid is an upward force that equal to weight of the volume of fluid that the object displaces Weight vs. buoyant forces An object in a fluid will only sink is the object weight is greater than the buoyant force. An object will only float when the buoyant force on the object is equal to the objects weight. Determining density you need to to know the objects mass and volume to determine the density of an object one way to find a mass of an object is to use palit multiplying the lenth is used to find the volume of a regular such aas a cube Determining density continued to find the volume of a regular solid use water displacement by