Water in rivers, in a glass, or falling from clouds obeys gravity. It's going to fall towards the ground because of the physical pull of the earth. But, what if we told you that you could turn a glass of water completely upside down and the water wouldn't fall to the floor? That's what happens in the Anti-Gravity Water demonstration. It's a simple experiment that dramatically demonstrates the amazing physical properties of water.
- Tall glass with a round edge
- A handkerchief
- A pitcher of water
- Bowl or sink
- Drape the handkerchief over the glass, making sure that you push the center of the handkerchief down into the glass.
- Fill the glass 3/4 full with water by pouring water into the middle of the handkerchief.
- Slowly pull the handkerchief down the sides of the glass making it taut (stretched tightly across the surface of the glass). Grip the ends of the handkerchief at the bottom of the glass.
- Place one hand over the mouth of the glass and turn it over with the other hand.
- Pull the lower hand away from the glass (slowly) and the water should stay in the glass! This just goes to prove that the handkerchief has anti-gravity properties. The thunderous applause will drown out the cries of, "How did you do that?"
- For the big finish, put your hand over the mouth of the glass and turn the glass right-side up. Remove the handkerchief from the glass and pour the water back into the pitcher. Of course, take your well-deserved bow.
How Does It Work?
Most people predict that the water will leak through the holes in the handkerchief because the water leaked through the holes as it was poured into the glass. The holes in the handkerchief literally disappeared when the cloth was stretched tightly across the mouth of the glass. This action allowed the water molecules to bond to other water molecules, creating what is called surface tension. The water stays in the glass even though there are tiny holes in the handkerchief because the molecules of water are joined together to form a thin membrane between each opening in the cloth. Be careful not to tip the glass too much because you'll break the surface tension and surprise everyone with a gush of water!
- Variation Review by M Licata
A variation of this experiment works well in the classroom. Fill a cup or beaker until it's overflowing with water. Then, place an index card or cardstock paper over the top, pressing down slightly to make sure it's touching the rim of the cup. With your hand securing the card onto the cup, turn the cup upside-down. When you're ready, remove your hand. The card will hold the water in the cup.
(Posted on December 11, 2009)
- anti-gravity water Review by little rose guerra
10/10 anti-gravity water is amazing yet simple but it gives thourough understandings with the students about gravity
(Posted on June 17, 2010)