BEWARE WHILE BOILING WATER FOR MORE THAN 2 MINUTES IN THE MICROWAVE
A 26-year old man 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 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 suddenly 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 a 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, (nothing metal).
General Electric's 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 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.
Here is what a local high school science teacher had
to say on the matter: 'Thanks for the microwave warning.
I have seen this happen before. 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 that the water is
heated in is new, or when heating a small
amount of water (less than half a cup).
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.
If you pass this on, you could very well
save someone from a lot of pain and suffering.
this is only for your
information, kindly take the advice of your doctor for medicines,
exercises and so on.
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 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 suddenly 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 a 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, (nothing metal).
General Electric's 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 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.
Here is what a local high school science teacher had
to say on the matter: 'Thanks for the microwave warning.
I have seen this happen before. 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 that the water is
heated in is new, or when heating a small
amount of water (less than half a cup).
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.
If you pass this on, you could very well
save someone from a lot of pain and suffering.
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posted by G S Iyer at 8:26 AM
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