Impress your friends! Woo the opposite sex! Utilizing the powers of chemistry and physics, The Post teaches you five basic bar tricks.
Trick #1: This Blows!
What you'll need: 1 empty beer bottle, 1 napkin What you'll do: Tear off a small piece of the napkin and roll it into a ball. With the rest of the napkin, clean out the inside of the bottle's neck, making sure it's as dry as possible. Hold out the empty bottle horizontally and place the small napkin ball just inside the lip of the bottle. Challenge your friend to try to blow the napkin into the bottle. Watch the frustration build and the napkin blows right back into your friend's face.
Why it works: Bernoulli's fluid flow principle. Because there is air going into the bottle and air wanting to get out
it's creating vibrations or 'resonance ' said Kenneth Hicks, physics professor at Ohio University. These vibrations push the napkin piece out of the bottle. The harder you blow, the greater the vibrations and the greater the force at which the napkin flies out the bottle.
Trick #2: Bottle Levitation
What you'll need: 1 empty beer bottle, 1 leather belt What you'll do: First, make sure the beer bottle is dry. The wetter the bottle, the tougher the trick will be to pull off. When no one is watching, rub your fingers along the leather belt you're wearing. Place the emp ty bottle upside down on the table. Then, place your thumb against the side of the bottle, hidden from your audience. Stick either your first or middle finger on the bottle's end. Your two fingers should now form a right angle. Levitate the bottle by slowly raising your fingers, applying slight pressure.
Why it works: Friction. Dry fingers maximize the friction which is necessary to lift the bottle
Hicks said. Drying your fingers with the leather belt, coupled with the 90 degree position of the fingers, maximizes the friction needed to levitate the bottle.
Trick #3: Beer Glass Power Tower
What you'll need: three identical, empty beer glasses What you'll do: Stack the three glasses on top of each other. To make sure you get it right, think of a clock face. Set glass (A) down on a flat surface. Place the second glass (B) on top of (A) at a 10 o'clock position. Set the third glass (C) on top of (B) in the 2 o'clock position. Collect your oohs and ahhs.
Why it works? Center of mass. Because you're positioning the glasses in those particular clock positions
the average weight will be directed down in a line. Essentially
the center of mass of the top two glasses combined is still balanced on the edge of the bottom glass
Hicks said. Try another trick with a deck of cards that works on the same idea. Put all 52 cards in one solid stack, Move the top card out halfway from the rest of the deck. The card will balance because the center of the card has not passed the edge of the deck.
Trick #4: A Quick Non-alcoholic Fix
What you'll need: 1 full bottle of beer, 1 full glass of water What you'll do: After opening the beer, seal the top with your thumb. Making sure it's air tight, turn the bottle upside down and lower it into the glass of water. Hold the bottle near the surface of the water. You'll begin to see the alcohol draining from the bottle in wisps. After the process stops, you'll have alcoholic water and an O'Douls.
Why it works: It's all about density. The alcohol in beer is denser than water so it will sink to the bottom of the glass. You're able to see it in wisps because of something called birefringence -the separating of two varying-density liquids, said Kenneth Brown, chemistry department chair at OU.
Trick #5: Paper Napkin Rose
What you'll need: 1 cocktail napkin What you'll do: Step 1: Fold the top edge of the napkin down two inches. Catch the fold between your first two fingers about one inch from the end.
Step 2: Wrap the napkin completely around your fingers.
Step 3: With your other hand, pinch below the two fingers inside the napkin. Remove your fingers from the flower.
Step 4: Continue to twist the napkin downward from the pinch. Stop halfway and work the corner of the napkin loose to create the leaf. Pinch securely and continue twisting.
Step 5: Give the rose to the blonde who's been eyeing you all night.
Source: Post research
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