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

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:

Element Temperature Density (kg/m3)
Water 0°C 998.2
Mercury 20°C 13,546

Anson Alexander

Anson Alexander is a blogger, author, SEO expert, teacher, and tech geek. As the founder of AnsonAlex.com, Anson works full time writing, editing, and producing content for his site and providing technical and business services to clients. He has a BS in international business and information systems from the University of Tampa. In his free time, Anson plays video games, enjoys nature, spends time at the beach, and loves to travel.

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