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µµ¼­°üȨ > Studyroom > science experiment
Á¦¸ñ ÀÛ¼ºÀÚ ¿î¿µÀÚ
7,561
 Straws Magic
 
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A cup with drinkable liquid, two straws
 
 

 

1. Place one straw in the liquid and drink.
 
   

 

2. Place two straws in the liquid and drink.-- do you get more or less liquid?
 
   
3. What happens? Why can't you always drink twice as much with two straws?
 
 
Reducing the pressure inside a machine causes suction. The pressure of outside air, which is created by the weight of the atmosphere, is greater than inside the machine. This difference in pressure can then be put to work. In a vacuum cleaner, the pressure of the outside air forces material into the cleaner. Power brakes may use suction to boost braking.

When you suck through a straw, the air in the atmosphere presses down on the drink and pushes it up into you mouth. Placing one straw outside the cup equalizes the pressure, so you don't get as much liquid through the straw in the cup.

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