Why does an ice cube float in water and not sink?

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Can you estimate the density of ice compared to water from looking at the picture above?

Notice that a small portion of the ice is above the surface. Estimate the fraction (or percent) of ice that is below the surface of the water. Click here, or on the image above, to take a sharper look.

At what temperature will the water freeze?

In the following experiment you will calculate the density of water and ice. You many want to review some concepts of mass, volume and density before you begin.

to begin the experiment

for a review of density