Cool science experiments

Is air pressure powerful? If this is your question, the answer is YES! Air pressure is able to crush a can! If you don't belive, try this experiment:
Step 1: fill an empty drink can with water and boil it. ADULT GUIDENCE!
Step 2: fill an basin with ice cold water
Step 3: use an clamp to hold the drink can and put it upside down into the basin
What will happen: The can shoud be crushed!

As an example of varying pressures, a finger can be pressed against a wall without making any lasting impression; however, the same finger pushing a thumbtack can easily damage the wall. Although the force applied to the surface is the same, the thumbtack applies more pressure because the point concentrates that force into a smaller area. Pressure is transmitted to solid boundaries or across arbitrary sections of fluid normal to these boundaries or sections at every point. Unlike stress, pressure is defined as a scalar quantity.

Another example is of a common knife. If we try and cut a fruit with the flat side it obviously won't cut. But if we take the thin side, it will cut smoothly. The reason is, the flat side has a greater surface area and so it does not cut the fruit. When we take the thin side, the surface area is reduced and so it cuts the fruit easily and quickly. This shows one of the good effects of Pressure.

Stay tuned for MORE COOL experiments!