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Have You Ever Seen a Cannonball Float? [Video]

Although the video was originally uploaded in 2006, it is still interesting to see a cannonball float.

Obviously a cannonball doesn’t float in water but because mercury is so dense, the mass of a cannonball is not enough to break the surface! The video was originally produced by BBC.

If you’re interested in why a cannonball will float in mercury but not in water, check out the small table I have put together below. We can see that at 20°C, mercury is more than 10x more dense than water.

Density of water compared to the density of mercury:

ElementTemperatureDensity (kg/m3)

Anson Alexander

I am an author, digital educator and content marketer. I record, edit, and publish content for AnsonAlex.com, provide technical and business services to clients and am an avid self-learner. I have also authored several digital marketing and business courses for LinkedIn Learning (previously Lynda.com).

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