Water in a cup

4 stars

A man in a restaurant asked a waiter for a juice glass, a dinner plate, water, a match, and a lemon wedge. The man poured enough water onto the plate to cover it.

"If you can get the water on the plate into this glass without touching or moving this plate, I will give you $100," the man said. "You can use the match and lemon to do this."

A few minutes later, the waiter walked away with $100 in his pocket. How did the waiter get the water into the glass?

 

Scroll down for answer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

First, the waiter stuck the match into the lemon wedge, so that it would stand straight. Then he lit the match, and put it in the middle of the plate with the lemon. Then, he placed the glass upside-down over the match. As the flame used up the oxygen in the glass, it created a small vacuum, which sucked in the water through the space between the glass and the plate. Thus, the waiter got the water into the glass without touching or moving the plate.
You can try this experiment at home with appropriate supervision.


Difficulty
  • Moderate
Type
    Submit your vote:

        

    Comments

    Wouldn't the combustion produce carbon dioxide, thereby preventing a vacuum?
    - CO2 (19 Mar 2010)

    heck i would slurp it up and spit it in the cup
    - nick (24 Mar 2010)

    Post your own comment

    Name:
    URL:
    Anti-spam check
    To prove you are human, what traffic light color means stop?(Hint: 3 letters, beginning with R)
    Comments:
    Note: comments may be edited and will not appear until approved