本文发表在 rolia.net 枫下论坛Subject: Don't HEAT WATER in MICROWAVE (not a joke)
>
> I was very glad to get this email from a friend, because I have been
guilty
> of heating water in a microwave many times. You'll be glad you read it. I
> also suggest passing it along to friends and family.
>
> About five days ago, my 26-year-old son decided to have a cup of instant
> 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. Then
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 buildup of energy. His whole face
is
> blistered and he has 1st and 2nd degree burns to his face, which may leave
> scarring. He may also 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 such as a
> wooden stir stick or a tea bag should be placed in the cup to diffuse the
> energy.
>
> Here is what our science teacher has 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.
>
> 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.
>
> Please pass this on to everyone you know, it could save a lot of pain and
> suffering.更多精彩文章及讨论，请光临枫下论坛 rolia.net
>
> I was very glad to get this email from a friend, because I have been
guilty
> of heating water in a microwave many times. You'll be glad you read it. I
> also suggest passing it along to friends and family.
>
> About five days ago, my 26-year-old son decided to have a cup of instant
> 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. Then
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 buildup of energy. His whole face
is
> blistered and he has 1st and 2nd degree burns to his face, which may leave
> scarring. He may also 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 such as a
> wooden stir stick or a tea bag should be placed in the cup to diffuse the
> energy.
>
> Here is what our science teacher has 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.
>
> 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.
>
> Please pass this on to everyone you know, it could save a lot of pain and
> suffering.更多精彩文章及讨论，请光临枫下论坛 rolia.net