TheGroupOfEngineers

New Year Going Soon !!! Let's Study for exam!!!

Wednesday, October 31, 2007

Do Not MicroWave Water !!!

Reader discretion is advised !!!

For those who use microwave to heat up water as a practice
pls be aware !!!
For those who wanna try this experiment, go ahead !!! Ask me
together to witness the result !!!

Here's a fantastic story before u start experiment !!!

A 26-year old decided to have a cup of coffee. He took a cup of
water and put it in the microwave to heat it up (something that
he had done numerous times before). I am not sure how long he
set the timer for, but he told me he wanted to bring the water
to a boil. When the timer shut the oven off, he removed the cup
from the oven. As he looked into the cup, he noted that the water
was not boiling, but instantly the water in the cup "blew up" into
his face. The cup remained intact until he threw it out of his hand
but all the water had flown out into his face due to the build up of
energy. His whole face is blistered and he has 1st and 2nd degree
burns to his face, which may leave scarring. He also may have lost
partial sight in his left eye. While at the hospital, the doctor who
was attending to him stated that this is fairly common occurrence
and water (alone) should never be heated in a microwave oven.
If water is heated in this manner, something should be placed in
the cup to diffuse the energy such as: a wooden stir stick, tea bag,
etc. It is however a much safer choice to boil the water in a teakettle.

Now understand the dangerous of the work???

Come on !!! Can anyone think of what is the reason behind ???

Here's the answer for it from General Electric

Microwaved water and other liquids do not always bubble when
they reach the boiling point. They can actually get superheated
and not bubble at all. The superheated liquid will bubble up out
of the cup when it is moved or when something like a spoon or
tea bag is put into it. To prevent this from happening and causing
injury, do not heat any liquid for more than two minutes per cup.
After heating, let the cup stand in the microwave for thirty seconds
before moving it or adding anything into it.
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