# Why does an egg float in saltwater?

An egg floats in saltwater if the water is denser than the egg. The salt adds density to the water, but if there is not enough salt, the egg sinks.

The more salt that is added to the water, the higher the egg or other less dense object floats. The density comes from the amount of molecules present in the water. Saltwater has more molecules than fresh water. Thus, varying amounts of salt can be added to water to have the egg float in different spots, such as the middle of the glass. Another factor to consider is temperature. Cool water is significantly more dense than warm water.

The rule of less dense objects floating in denser water applies to larger scenarios as well. It is easier for a person to stay afloat in the ocean than in a swimming pool. Ships can easily float because they spread their density out on the surface and because some ships have air pockets, which is much less dense than water.

This concept even applies to scuba diving. Divers must make sure that in saltier water they wear more weight so that they can move and actually sink. Some have to double their body weight to adequately dive.

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Q&A Related to "Why does an egg float in saltwater?"
 The density of an egg is higher than plain water (so an egg will sink) With enough added salt, the saltwater solution density is higher than the egg's, and the egg will then float. http://www.ask.com/web-answers/Science/Other/why_d...
 An egg is almost entirely made of water. The other components (shell, proteins etc. add the the weight of the water and cause the egg to sink. Adding salt to the water in the container http://wiki.answers.com/Q/Why_does_an_egg_need_sal...
 Density is a measurement of mass in a given volume; you can calculate density mathematically dividing an object's mass by its volume. The higher an object's density, the more mass http://www.ehow.com/info_8729757_egg-float-add-sal...
 Salt water is more dense than normal water, which makes it weigh more, so more http://www.chacha.com/question/why-does-salt-water...
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