# What is buoyancy?« Back to Questions List

In science, buoyancy is an upward pressure exerted by using a fluid that opposes the weight of an immersed object.

The forces at work in buoyancy. for the reason that upward force of buoyancy is the same as the downward pressure of gravity, the item is floating.

In a column of fluid, power increases with depth on account of the load of the overlying fluid. for this reason a column of fluid, or an object submerged in the fluid, experiences greater force on the bottom of the column than at the prime. This difference in pressure results in a internet power that tends to speed up an object upwards. The magnitude of that pressure is proportional to the difference within the pressure between the top and the underside of the column, and (as defined by way of Archimedes' principle) can be identical to the burden of the fluid that may in any other case occupy the column, i.e. the displaced fluid. that is why, an object whose density is greater than that of the fluid during which it's submerged tends to sink. If the thing is both less dense than the liquid or is shaped accurately (as in a ship), the force can maintain the object afloat. this can occur simplest in a reference body which both has a gravitational field or is accelerating due to a power rather than gravity defining a "downward" course (that's, a non-inertial reference frame). In a situation of fluid statics, the online upward buoyancy pressure is the same as the magnitude of the load of fluid displaced by way of the body.

The heart of buoyancy of an object is the centroid of the displaced extent of  fluid.

(Please refer the previous question 'What is meant by  density? What is the effect of temperature on density?' for better understanding of density.)