Making organ? Not difficult

Have you wondered about how we can breathe? This experiment is going to show you how we breathe in and out.

Time: 10~15minute

Cost: 200peso

Area of Science and Topic: Pressure and heat

Learning objectives: Mechanisms of the body parts, pressure

Materials: Knife, 1.5L plastic bottle, clay, Straw, balloon

Procedure:

1. Cut plastic bottle into half
2. Put two straws in the bottle through the opening and close the gap with clay
3. On the other side of straw, attach two ballons.
4. Cut one ballon in the half.
5. Stretch the half piece of ballon and tie the bottom of the bottle
6. Stretch the bottom piece of the ballon and you will find two ballons blowing up

Why does this happen? Basically, as ballons and clay covers the openings of the bottle, the bottle becomes air locked.this means that the oxygens can niether get inside or come out. If the half piece of the ballon gets stretched, the space inside the bottle increase and more volume will be requied inside. As a result, more volume will be required. Thus the two ballons attached to ballon will suck air to fill the space inside the ballon. Like the human body, the ballons which fuction as lungs will blow bigger.

★Tips on the experiment
Do not let the kids use the knife when cutting the bottles.

Accompanying worksheet