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Introduction:
This project is based on surface tension. Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force.
In this project, I will demonstrate how surface tension works. The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension. The molecules at the surface do not have other like molecules on all sides of them and consequently they cohere more strongly to those directly associated with them on the surface. This forms a surface "film" which makes it more difficult to move an object through the surface than to move it when it is completely submersed.
Procedure:
1. Fill the wine glass to the rim with water.
Materials:
-A wine glass
-Water
-1000 push pins
Scientific Principle: It is revealed, for example, in the floating of some objects on the surface of water, even though they are denser than water, and in the ability of some insects to run on the water surface. This property is caused by cohesion of similar molecules, and is responsible for many of the behaviors of liquids. In the bulk of the liquid, each molecule is pulled equally in every direction by neighboring liquid molecules, resulting in a net force of zero. The molecules at the surface do not have other molecules on all sides of them and therefore are pulled inwards. This creates some internal pressure and forces liquid surfaces to contract to the minimal area.
2. Slowly drop push pins in the wine glass one by one.
3. Continue to drop it push pins until there all in the wine glass.
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