How is buoyancy affected by different liquids?

Question

Im just tring to get some ideas for a science project.

Answer 1

Buoyancy is a key factor when considering a ships sea worthiness. To much and the ship turns over on its side, not enough and it sinks like a rock.

Answer 2

Bouyancy is affected by the the density (specific gravity) of the liquid. A floating object displaces liquid in to its own mass. In a denser liquid this results in the object floating 'higher' in the liquid (less of it being submerged).

This effect is used in an instrument called a hydrometer which can measure the density (specific gravity) of a liquid. One science project is to make your won hydrometer, maybe calibrate it with a couple of known liquids and then measure the density of some unknown liquids ... or plot a graph of 'depth submerged' against density of some liquids with known density.
You can 'tune' the density of liquids by dissolving things like salt in water (but be aware that the volume will change a bit as well when you (e.g.) add salt to water)

You can take a look at http://www.southwest.com.au/~jfuller/liquids/hydrometers.htm
for inspiration. Best of luck with the project.

I am PhD chemist and science teacher

Answer 3

It is simple due to the density of the liquid. A peice of ice floats on water, however the same peice of ice would sink in a solution of pure toluene.

Infact something interesting about water and ice. If you put an ice cube in a glass, and fill the glass with water to the very brim. Knowing that water expands when it freezes, when the ice cube melts will any of the water spill of the sides of the glass?
The answer is no. Can anyone figure it out?

Answer 4

Bouyancy is based on the specific gravity of the liquid. The heavier the liquid, the easier objects float.

Answer 5

Well you could do what would float a can of coke or diet coke. One of them floats im sure of it. The weight of the liquid had to do with whether it floats and the surface area of the liquid also affects if it floats or not.

Answer 6

The buoyant stress is = rVg the position r is rho, the density of the liquid, V is the volume of the article it truly is submerged contained in the liquid, g is the acceleration as a results of gravity. so no, the quantity of water contained in the beaker does not count number, and in case you spill some water out, the buoyant stress remains te same.

Answer 7

specific gravity.
go google