2.When a hot can was dropped into cool water, the can quickly shrunk.Because of the P = nRT / V, when n, R,V do not change but T, when T decreases quickly, the P decreases quickly. Since when the pressure of inside of can becomes smaller, but outside does not change, so outside of air pressure is more stronger than inside, then the can's volume becomes small quickly.
3.Test the pressure on U shape test tube: take few water into U shape test tube, and mark water level, when one person blow either side of it, that side's water will go to under the level, other side's water is upward to the level.
4.Experiment for finding relationship between Volume and Pressure.
Temperature and Perssure
Volume and Temperature
Experiment about the volume changing, when balloon and marshmallow are putted into a tool that could change pressure. When it starts to decrease the pressure, the balloon starts to become bigger. when it goes back to the normal pressure, the balloon backs to normal size. However, when the balloon is changed to marshmallow, when the pressure backs to the normal pressure, the pressure will become smaller than the initial size because its inside bubbles break when the pressure is decreased.
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