Surface Tension and Air Pressure

SURFACE TENSION AND AIR PRESSURE

テキストボックス:

テキストボックス: SCIENCE CONCEPT

テキストボックス: Why does the water remain on the glass and did not pass though the holes of the net? This is because of the surface tension of the water. The surface tension of the water on holes of the net holds the water from dropping. Try to touch the net with your finger and the water will goes down because you break the surface tension of the water. Why is that when the cap was opened, the water drop from the bottle? This is because of the additional air pressure from the surrounding. When cap was opened, air goes inside the cap and thus, pushing the water enough to break the surface tension of the water.

Taking it further:

1. Ask students if they can relate the experiment on the technology we are using in our daily life.

1. Cover the mouth of the drinking glass by the net using the rubber band.

3. Slowly pull the glass upward until it is above the water. Observe what happen.

4. This time, cut the plastic bottle into half. Put aside the bottom part of the bottle.

5. Cover the upper half with a fine weave net using a rubber band as shown in the picture.

6. Repeat procedure 2 and 3 then, slowly open the bottle. Observe what will happen to the water.

2. Dip the glass into the water facing the net to the water.

PROCEDURE:

· Transparent drinking glass

· Fine weave net

· Rubber band

· Pot of water (transparent)

· Plastic bottle with cap

· Scissors or cutter

テキストボックス: EXPERIMENT LISTS PHYSICS Balancing a Dragonfly Does Air Takes Up Space? Improvised Battery (Option 1) Improvised Battery (Option 2) Improvised Battery (Option 3) Tornado in the Bottle Diver Surface Tension and Air Pressure Aluminum Wrap Railway Light to Sound Magnetic field in 3D Simple Kaleidoscope Art in Polarizer Simple Spectroscope Electrostatic Motor Paper Earphone CHEMISTRY Vegetable/Fruit Charcoal Red Cabbage Extract (Identifying Acidity of a Liquid) Alkalinity of a Liquid Crayon Making Hand Printing using Soap Testing Raindrop Acidity using Red Sweet Potato Powder Magic! (Water doesn’t fall?) BIOLOGY 1. Leaves Puzzle ACTIVITIES Fossil Hunting Gold Sieving Smelting Steel Observing Classes Attending Trainings

テキストボックス: VOCABULARY Surface Tension— is a property of the surface of the liquid that allows it to resist an external force. (http://en.wikipedia.org) Air Pressure—is the force per unit area exerted against a surface by the weight of air above that surface in the Earth's atmosphere. (http://en.wikipedia.org)

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