Fire and Water Magic Trick

Here's an easy science trick you can perform using a candle or match, a glass and a plate containing a little water. Pour some water in a plate. Set a burning candle or match on the dish. Cover the flame with a glass. When the flame burns out, water will rush into the glass, raising the level of liquid. Do you know how it works? The heat of the flame raises the temperature of the gases trapped in the glass, causing them to push outward against the liquid. When the flame is extinguished, the temperature of the gas falls, lowering the pressure and allowing the water to flow into the glass.

Category:

Science & Technology

Tags:

• magic tricks
• fire
• water
• candle
• science tricks
• burning

[TheZatzke]

Burning is a chemical reaction taking Oxygen and creating Carbon Dioxide. Carbon dioxide has more mass than air (Density = Mass/Volume) and since the fire converts Oxygen into a more massive material, then the volume inside the glass must "decrease" (D = M/V, if M increases, V must decrease). This leaves a negative pressure inside the glass, and to compensate for that negative pressure water is essentially "sucked up" into the glass, in the attempt to gain more volume to be back at equilibrium.

[tsveta73]

Vacuum?



[xiaoli26]

WHAT KIND OF SORCERY IS THAT

[RoseSHINee]

OXYGEN IS THE ANSWER.

[thepeterbro1]

the flame takes is oxygen, and since all of the oxygen is cut off by the cup, It creates a vacuum effect and since it cant taking in oxygen it takes in water

[kmanmoney065]

@kmanmoney065 guess

[kmanmoney065]

the fire pushes away the water cause of the glass's air inside of it then when the fire dies out it because the fire has no air 2 burn it needs air then when the fire goes out the water comes back in the blass cause of the heat

[kushaalgupta1]

i can explain this.this happens because in the glass after the combustion ends there is no oxygen in the glass as combustion uses up all the oxygen and the space of the oxygen is taken up by the water. simple.

[cureheis]

@TheZatzke wtf are u like in 23987564375846th grade

[siansvids]

@siansvids AND IM A YR 7

[siansvids]

@alexisboss123 why it's so simple!

[siansvids]

well yeah because if you put a burning candle in the cup then the heat in there will take up more room and once it's gone the heat supply turns into condensation making more room and it allows more water but not all of it in.simple