Fun Science Experiments With Household Items

The flame heated the air molecules inside the bottle and caused the molecules to move away from each other. Some of the air molecules escape from the bottle because the egg acts like a one way valve (air goes out, can't come in). When the flame goes out, the air molecules cool and come closer together. However, since some of the air molecules left the bottle and can't get back in past the egg, the pressure inside of the bottle drops. With the pressure outside the bottle greater than inside of the bottle, the air outside forces the egg into the bottle!

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The water vapor created from heating the can pushed air out of the can. When the can is inverted and placed into the cold water, the water vapor in the can condenses quickly. Like the egg in the bottle experiment, the pressure in the can decreases quickly. The outside pressure is much higher than inside which causes the can to collapse!

The Mythbusters video above explains this very well and in more detail. The concept is pretty simple. The mentos and soda react and produce carbon dioxide gas. The gas then escapes out the top of the bottle creating an amazing soda fountain.

This experiment utilizes an acid-base reaction. Mixing the vinegar(acid) and baking soda(base) causes a chemical reaction that releases carbon dioxide gas. Since gas needs more room than either solids or liquids, it fills the balloon. This same concept is used for the exploding bags and bottles. Do those at your own risk.

This experiment uses the concept of cohesion and adhesion. Cohesion is the attraction of molecules that are the same to each other. Surface tension allows the water molecules to form a membrane. As a result water stays in the bottle even after the index card has been removed. The water molecules are bound together to form a thin membrane between the screen openings. When you tip the bottle it breaks the surface tension and the water comes gushing out.

Science can be addicting. Once I started doing some of these experiments I could stop searching the internet for more fun science experiments to do. There are countless experiments that can be done without having to buy an expensive kit. I came across an ebook that had a few of these experiments and many more. If you need more entertainment, More Fun Science Experiments!