[PreWar] Fw: CHECK THIS OUT - BOILING WATER -
ds122945 at yahoo.com
Thu Oct 21 22:23:16 MDT 2010
Sent: Thursday, October 21, 2010 10:07 AM
Subject: FW: CHECK THIS
OUT - BOILING WATER -
Date: Thu, 14 Oct
2010 19:03:15 -0700
Subject: Fwd: FW: CHECK THIS OUT - BOILING WATER -
>Subject: CHECK THIS OUT - BOILING WATER -
>in case you don't know.......
>Science 101b&and NO most of us did NOT know thisb&look, read, and
>>>B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B
>>>B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B
B Microwaving B Water!
>>>A B 26-year old man decided to have aB cup of
coffee. He took a cup of B water and
>>>put it in the microwave to heat it up
(something that he B had done numerous
>>>times before). I am not sure how
long he set theB timer for, but he wanted to
>>>bring the water to a boil.
When the B timer shut the oven off, he removed the cup
>>>from the oven. As
heB looked into the cup, he noted that the water was not
suddenly the water in the cup 'blew up' into his face. The cup
intact until he threw it out of his hand, but all the B water had flown
>>>out into his face due to the buildup of energy. B His whole face is
>>>he has 1st and 2nd degree burns toB his face which may leave
>>>He also may have lostB partial sight in his left eye.B While
at the hospital, the
>>>doctor who was attending to him stated that this is a
fairly common B occurrence
>>>and water (alone) should never be heated in
aB microwaveB oven. If water is heated
>>>in this manner, something should be
B placed in the cup to diffuse the energy
>>>such as a wooden stir B stick,
tea bag, etc.., (nothing metal).
>>>General B Electric's Response:
>>>Thanks for contacting us, I will be happy to assist you. The e-mail
>>>received is correct. B Microwaved water and other liquids do
notB always bubble
>>>when they reach the boiling point. They can actually
B get superheated and not
>>>bubble at all. The superheated liquid
willB 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 B happening and
causing injury,B do not heatB any liquid for
>>>more thanB two minutes per
cup. After heating, let the cup stand in the microwave
seconds! before moving it or adding anything into it.
>>>Here is what our
local scienceB teacher had to say on the matter: 'Thanks for the
B warning. I have seen this happen before. It is caused by a
known as super heating. It can occur anytime water isB heated
particularly occurB if the vessel that theB water is heated in is new, or
>>>when heating a small amount of water B (less than half a cup).
happens is that theB water heats faster than the vapor bubbles can form. If
>>>the cup is very new then it is unlikely to have small surface scratches
>>>it that provide a place for the bubbles to form. B As theB bubbles
cannot form and
>>>release some of the heat has built up, theB liquid does
not boil, and the liquid
>>>continues to heat up well past its boiling point.
>>>What then usually happens is thatB the liquid is bumped or jarred,
which is just
>>>enough of a shock toB cause the bubbles to rapidly form and
expel the hot liquid.
>>>The rapid formation of bubbles is also why
aB carbonated beverageB spews B when
>>>opened after having been B shaken.'
>>>If B you pass this onB B you could very well save someone from a lot of
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