class 5-6

A magnet has two poles – a North pole and a South pole. It is at each pole that the magnetic force is the strongest. When the like poles of two magnets are brought together, they push or repel each other. When unlike poles are brought together, they pull or attract each other.

The card remains attached to the rim of the glass and does not allow the water to flow out is due to Atmospheric pressure. Atmospheric pressure is the force that holds the card in place. The card stays on the upside-down glass because the pressure of the air molecules pushing up on the card is greater than the weight of the water pushing down.

When the flames inside the bottle become extinguished due to lack of oxygen, the gas inside the bottle cools. This cooling causes the pressure of the remaining gas inside the bottle to become less than outside atmospheric pressure. At that point, atmospheric pressure pushes the egg inside the bottle.

This science experiment will demonstrate how the pressure of the air outside is stronger and that can crush a bottle.

When the bottle filled with water is dropped, the water and air inside the bottle will fall at the same rate due to gravity