To check the buoyancy we have to check all the elements of the formula.Firstly , water is placed in a bucket. A Wooden piece is sinked in the bucked. We check if the wooden cube flows. After that an ironed cube , same sized as the wooden one is sinked in the same bucket and we see if is flows or note. Sometimes buoyancy changes depending the elements the water contains. To calibrate that , a common cooking salt is sinked and deluded properly with the water. The same objects are sinked in the bucket of salty water the same way as before. After that we notice that the density of the water is changed dramatically by adding salt. So buoyancy depends from the object's and liquid density !
Christos Mattheou
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