Upward motion of the forearc is related to buoyancy forces and the downward motion is associated with the tectonic forcing which causes the oceanic lithosphere to descend.
32.
That small pressure differential multiplied by the large surface area ( at right angles to the gravitational field ) gives you the value for the buoyancy force.
33.
However, it then bobbed up to the surface due to buoyancy forces that allowed the ice to float free of the boat once it was underwater.
34.
That bigger balloon will only lift the i-phone, the buoyancy force acting on it will be much smaller than that on the smaller balloon.
35.
As sunlight shines on the balloon, the air inside is heated and expands causing an upward buoyancy force, much like an artificially heated hot air balloon.
36.
The buoyancy force driving the convection is roughly g \ Delta \ rho L ^ 3, so the corresponding pressure is roughly g \ Delta \ rho L.
37.
As the bubble ring rises, a lift force pointing downward that is generated by the vorticity, acts on the bubble in order to counteract the buoyancy force.
38.
Convection can be " forced " by movement of a fluid by means other than buoyancy forces ( for example, a water pump in an automobile engine ).
39.
In other cases, natural buoyancy forces alone are entirely responsible for fluid motion when the fluid is heated, and this process is called " natural convection ".
40.
Guillemots were observed to use lift based swimming intermittently during the ascent phase of a dive but rely mostly on passive buoyancy forces to lift them to the surface.
