View Full Version : Coffee Drinkers! Read!


boyTi899
12th Jan '07 Fri, 12:23
I dont know if u guys have received this email message from wherever source..but anyway, I just wanna share this thing to you I received just this morning.

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.

General Electric's (GE) response:

Thanks for contacting us. I will be happy to assist you. The e-mail that
you received is correct. 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.


:D

dheng28
12th Jan '07 Fri, 14:26
connected to thermodynamics pare... umabot s supercritical point yun... it possible happened...

how sad...


:noidea: :noidea: :noidea:

Global360
12th Jan '07 Fri, 14:33
but nlng hndi ako sa micro nagiinit ng tubig :)

dheng28
12th Jan '07 Fri, 14:43
khit egg pre bawal... pro ntry ko sandali lng... ngcrack yng egg... hehehe!!!!


:dance: :dance: :dance:

boyTi899
12th Jan '07 Fri, 16:58
connected to thermodynamics pare... umabot s supercritical point yun... it possible happened...

how sad...


:noidea: :noidea: :noidea:

ayun! thermodynamics! actually topic namin yun sa physics just recently, pero di ko lng alam how it physically happens, na pwede pla yun mangyari sa mga simpleng bagay lang..:mybad:

tartimorion
12th Jan '07 Fri, 17:38
tsk! buti na lang wala kaming microwave....oven lang meron kami. uling pa.

boyTi899
12th Jan '07 Fri, 17:58
Para maliwanagan tau kung bakit nangyari un:

It is caused by a phenomenon known as super heating. It can occur any time water is heated and will particularly occur if the vessel in which the water is heated is new.

What happens is that the water heats faster than the vapor bubbles can form. If the cup is very new then it is unlikely to have small surface scratches inside it that provide a place for the bubbles to form. As the bubbles cannot form and release some of the heat that has built up, the liquid does not boil, and the liquid continues to heat up well past its boiling point. What then usually happens is that the liquid is bumped or jarred, which is just enough of a shock to cause the bubbles to rapidly form and expel the hot liquid. The rapid formation of bubbles is also why a carbonated beverage spews when opened after having been shaken.

dheng28
12th Jan '07 Fri, 20:14
uu superheat pare... hindi lng kc ang boiling point ng tubig eh 100'C mnsan mas mataas p s 300... nsa steam table yn... khit steam table ang twag eh posible 2phase yng tubig isang wet and isng dry... thermo!!!!


:dance: :dance: :dance:

Global360
12th Jan '07 Fri, 20:32
ok to,science,my matutunan tyo!

dave_england03
12th Jan '07 Fri, 21:58
wow may ma iikwento na ko sa tropang bikers ko sa shell select na mahihilig magkapi.. thanks for sharing bro!

OT:
Taga las pinas ka rin pala boytigsoy.. madalas kami tol tambay sa shell times, everynight.. hehe.. pasyal ka dun minsan kape tayo! yeehaa

kerstinne25
13th Jan '07 Sat, 07:22
Ayos to a, bigla ko nakilala ang mga kptid ko sa pananampalataya..:rofl:..
ang gagaling nyo mga bro! kudos s mga engineers :)

boyTi899
13th Jan '07 Sat, 22:04
@dave..cge pag may sinundo ako sa perpetual..tga admiral ako.

dheng28
13th Jan '07 Sat, 22:32
husay mo sa physics ah! physics major k b??hehe

ako po b?

kng ako po ssssaaaaaaallllllllllllaaaaaaaaaammmmmmmaaaaaaaaat ttt!!!!

s thermodynamics yn pre prng advnce physics major in water and steam .... hehehehe!

:dance: :dance: :dance:

boyTi899
13th Jan '07 Sat, 22:37
oo ikaw na nga yun tinutukoy ko! paturo naman! try natin yung kape..:)

dheng28
14th Jan '07 Sun, 00:17
s kape pre gnun din... additives lng nmn yn... ang png kntra s microwave eh posible tea bag... kc ang ngyayari s MICRO wave eh s taas baba kaliwa kanan dumadaan yun kaya naiwan yng critical point nya... walang na daanan yng heat... eh s teabag my substitute...


:dance: :dance: :dance:

margaux_sofya
14th Jan '07 Sun, 04:58
wow.. thanks for the warning.. i usually do that here in the ofice..

boyTi899
14th Jan '07 Sun, 10:44
now u know..mabuti nang umiiwas dba?

dheng28
14th Jan '07 Sun, 23:10
ayan ngyn alm nyo n ang dpat gawin pra di matulad s tao n yun...


:dance: :dance: :dance:

jovrea27
15th Jan '07 Mon, 14:28
buti na lang, wla microwave sa bahay... :lol: :lol:

kurdapyangbasa
16th Jan '07 Tue, 20:34
ganun pala yun..

hmx_ryan
17th Jan '07 Wed, 10:55
Natakot ako sa Title ng thread na to... akala ko kung ano na tungkol sa kape... Wheeew... Coffee adict pa namam ako... nakaka 4-6 cups pa naman ako everyday... hehehehe.... Pwede bang e-change ang title ng thread into Boiling Water inside the Microwave Oven or Physics: Boiling water in Microwave Oven...hehehe...(joke lang)

dheng28
21st Jan '07 Sun, 21:36
naku!!! 6-8 cups of cofee!!! thats bad pre!!! masama tlaga...

kng ako syo bawas bwasan mo n ang pagiinm ng kape... try mo apple... kc ang apple ang katapat ng cofee...

s umaga pre...


:mybad: :mybad: :mybad:

sweetangel
12th Jun '08 Thu, 23:42
:thumbsup::thumbsup::thumbsup:

salamt salamt...khit di aq umiinom ng kape...


:lol::lol::lol: