what creates the bouyancy which enables ships to float?

Answer 1

Bouyancy is created by the integrated pressure of the fluid that is displaced by the volume of the object.

It can be calculated by the difference between the weight of the volume of fluid displaced by the object and the object's weight.

For an example, a 10-ton submarine that displaces 20-tons of water has 10-tons of bouyancy. The sub will rise in the water until it reaches the surface, then float at a level where only 10-tons of water are displaced.

http://en.wikipedia.org/wiki/Buoyancy

Answer 2

Buoyancy is the total force exerted on an object by a fluid (such as water) it is immersed in. It is equal to the weight of fluid displaced by the object (from. Archimedes' principle), regardless of the shape of the object. A ,boat will sink or rise in the water until the buoyancy exactly equals the weight of the boat. Ships float because they are carefully designed to do so. Basically by being full of air so that the average density is less than that of water and the ship will float half out of the water, even if the hull is made of steel. If you change the density of the water, e.g. fresh water instead of salt water, the ship will float lower. It's been suggested that methane bubbles from the sea floor (making the water less dense) might have sunk ships in the Bermuda Triangle

Answer 3

The pressure, or force per unit area, at any depth in any liquid can be shown to be equal to the density of the liquid times the acceleration due to gravity times the depth beneath the surface of the liquid. The equation representing this is
P = ρgd

For simplicity, envision a rectangular prism (box, cube, etc.) lowered into the liquid. The force against the sides will cancel out, one side receiving the same force as its opposite, but in the opposite direction. The force on the bottom of the prism will be the product of the pressure and the area of the bottom of the prism:
F(up) = PA
but P = ρgd, so
F(up) = ρgdA
dA = V, or the volume of liquid displaced,
ρV = M, or mass of the liquid displaced, and
Mg = W, or weight of the liquid displaced.
F(up) = ρgV

Should the prism be totally immersed, there will be a force acting down on the prism equal to its depth below the surface,
P = ρgd2
F(down) = ρgd2A
F(up) - F(down) = ρgdA - ρgd2A = ρgA(d - d2)
d - d2 = h, the height of the prism, so
F = ρgAh = ρgV, where V is now the volume of the prism.

It can be shown using calculus that these equation holds for any shape, and you can short-cut this whole process by stating that bouyant force is equal to the weight of the volume of liquid displaced. If the buoyant force is greater than the weight of the object, the object will float.

Answer 4

The bouyancy is created by the water fighting to get back into the 'hole' made in the water caused by the boat's hull. The more the ship weighs, the better it is at fighting to keep its hole and the lower in the water it floats.

Salt water is heavier that fresh water -- so salt water is better at fighting to get back into the hole -- so the ship floats higher in salt water than in fresh.

Answer 5

Buoyancy of an object is equivalent to the weight of the fluid displaced by the object. Which is why steel ships float steel is heavier than water but because it's hollow if displaces more water weight per unit of mass, and thus floats.

Answer 6

Displacement

Answer 7

well buyoncy is created by the amount of water the ship is displacing

that is the weight of the total volume of the ship under the sea level.

Answer 8

The displacement of water by the ships's hull.

Answer 9

The weight of the ship is kept to being less than the amount (weight, mass) of water it displaces.

Answer 10

displacement. Bernoulis Primciple applies here