Sunday, May 31, 2009

Heating a Water in a Microwave? Think twice!

Just received an e-mail today on my Yahoo Groups that I want to share with you guys.

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 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 acarbonated beveragespews when opened after having been shaken.

Saturday, May 2, 2009

5 Hours to go for the Kentucky Derby 2009

The 2009 Kentucky Derby Post Positions, Entries and Odds are now available online! All Horse jockeys and racing fans are now excited for the 2009 Kentucky Derby. The Kentucky Derby officials released Kentucky Derby Post Positions for this year. And I’m pretty sure, people will now start to think what are the odds of the 2009 Kentucky Derby

Early favorites to win the 2009 Kentucky Derby are Old Fashioned, Haynesfield, Pioneer of the Nile, Friesan Fire, Stardom Bound and Flying Pegasus. This year marks the 135th Kentucky Derby Festival. The official race will happen on May 2 and will be televised in the United States via NBC.

Here are the official 2009 Kentucky Derby Post Positions.

Watch and Spend Money or Watch for Free?

Are you going to watch Manny Pacquiao Vs Ricky Hatton on cinemas or PPV? Or are you going to watch it for free? Let's Watch Hatton Vs Pacquiao Live Stream will be available tomorrow. This is the only working live stream channel that I know and I want to share it with you. Let’s all support and watch the prestigious match for the IBO Light-Welterweight belt! If the channel didn't work, please don't hesitate to contact me so that I can provide you with a different working live stream channel of the Pacquiao Vs Hatton match.

For me, I'll watch the replay video and will also watch a free live stream of the said fight. That's all!
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