Floating spheres in antifreeze strength tester

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Homework Statement


A simple device that is used to test the strength of antifreeze in cars consists of a small tube that has several small, coloured spheres inside it. When antifreeze is admitted into the tube, some of the spheres will float, giving an indication of the strength of the antifreeze.


Homework Equations



density

The Attempt at a Solution


Since the question mentioned that the spheres will float, I'm thinking that the densities of the spheres indicate the strength of the antifreeze. Since the spheres float, they are less dense than the antifreeze and therefore antifreeze is strong. am i right?
 

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Based purely off of what is written, I'd agree.