CLICK HERE FOR FREE BLOGGER TEMPLATES, LINK BUTTONS AND MORE! »

Thursday, January 15, 2009

Microwaving Water

Received this email from my sister Ella and I would like to share it to those who didn't know this information.

It's starting to get cold and if you make tea or anything that requires you to "nuke" water this might be of importance. I've done this quite a few times but never knew this……………………..

Microwaving Water!

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 (al one) 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 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.

Here is what our local 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 anytime 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 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.'

Photobucket

8 comments:

Keyword

Submit your Blog to our Newest PR 3 Web Directory for Bloggers. Visit KeywordDir.info

Keyword

Submit your Blog to our Newest PR 3 Web Directory for Bloggers. Visit KeywordDir.info

Jade

Oh my gosh thi is so scary! I never do that but still...

Happy New Year pala dear!

My new-old blog is back, drop by sometime http://pinayjade.com

jonaver

Hi Sis!

Thanks for the info.. I don't really do this but couple of days ago, we were at my in-laws' ranch and my mother-in-law is heating the water for our hot chocolate in the microwave.. I will tell her about this so that she'll know...

Happy New Year Sis! :-)

Jacqueline

This info needs to be placed on top of every microwave for the consumer to read before buying.

Jane Doe

Thanks for the warning! I usually use a teapot on the stove to heat water but do occasionally pop it in the microwave. I will be sure to use these precautions when I do!

Mel Alarilla

Dear Fellow Member of Filipinos Unite!!!,

We enjoin you to please copy and paste the Prayer Tag and Link For The Philippines and The Filipinos and post it at your own blog. You can add your other blog/s at the end of the link or if you have only one blog and are already included in the link, you may repeat your blog’s name at the end of the link. Be sure to utter the prayer for 9 consecutive days or as often as you can. Tag as many bloggers as you can, preferably Filipino bloggers. But only bona fide Filipinos will be included in the official registry of all Filipino bloggers. As a service to our fellow members, may we request you to please visit at least 10 members a day- 5 members that you know and 5 members that you do not know so that we can help each other improve our page rankings. Please copy the whole post from the picture to the end of copy sign.

Thank you very much for your wholehearted support of this project. God bless you and your family always.

Very repectfully,

Mel Alarilla of Filipinos Unite!!!

Sherry

Very interesting. I had no idea! I use the microwave for that purpose a lot.