1. There are several kinds of main pressures. they are air pressure, water pressure and force pressure.
2. Pressure is influenced by the area and the weight / force of object.
3. The narrower the area of an object, the greater the pressure will be.
4. according to Pascal, liquid will give the same pressure to all parts of isolated container.
5. work means force that causes displacement.
6. there are 2 kinds of energy. they are kinetic energy and potential energy.
7. according to the Principle of energy conservation, energy can't be created nor destroyed. it can only be changed.
8. in formula, we can express the principle as Ek = Ep.
9. Power means the work done per time.
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