الاثنين، 28 يناير، 2013

بحث تجربة علمية بسيطة بالانجليزية

Scientific experiments
The first experiment
:
Needle floating on the surface of the water
You can float a needle on the surface of the water?
The following experiment that enables you to check it out.
Materials needed:
Cup glass.
Water.
****l needle.
Tissue.
Cleaning fluid.
Action Steps:
1. Pour the water in the cup.
2. Put the needle on tissue paper and placed gently on the surface of the water. What do you notice?
3. Apply a drop of cleaning liquid in the cup. What do you notice?
What happened?
When you put the cloth on the surface of paper towel and dive into the water longer needle floating on the surface of the water, and the password that the surface of the water act as a membrane stretched over it a needle, called this property of liquids tighten surface.
But when you put a drop of cleaning liquid in the water, the intensity of the surface will be less sinks the needle.
Scientific interest
You can a lot of small insects on the surface of the water to stand and walk by taking advantage of the phenomenon of surface tension of water

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