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Microwave Superheating Warning - Public Service Announcement
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Netphilosopher
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Joined: 14 Jan 2011
Posts: 1,602
Location: USA
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Posted Fri May 3, 2013, 6:27am
Subject: Microwave Superheating Warning - Public Service Announcement
 

Microwaves are very convenient for boiling water.

PLEASE BE CAREFUL to use a stir stick (the paddle from an AeroPress works well) or something in the vessel to make sure the water actually boils.  When it's a rolling boil, it's also best to wait several seconds before removing from the microwave.

Adding a utensil, or even a single particle of coffee grounds, or sometimes just the act of moving an undisturbed superheated vessel of water can cause it to flash-boil violently.

http://www.snopes.com/science/microwave.asp

http://www.youtube.com/watch?v=1_OXM4mr_i0
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msboo
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Posted Fri May 3, 2013, 7:27am
Subject: Re: Microwave Superheating Warning - Public Service Announcement
 

Thanks for posting this, Net----extremely important!

I just saw this on TV recently---food show celeb spoke about this then put a wooden chopstick in water before putting in the MW to boil.
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Netphilosopher
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Joined: 14 Jan 2011
Posts: 1,602
Location: USA
Expertise: Just starting

Posted Fri May 3, 2013, 7:38am
Subject: Re: Microwave Superheating Warning - Public Service Announcement
 

was just reminded of it... this morning.  Forgot to toss my AP paddle into the pyrex cup in my morning fog.  Luckily I remembered before moving the cup, and it flash-boiled when I just tapped the side of the cup twice.

If I had just pulled it out and/or did something drastic like tossing coffee grounds into it before stirring it, I might have been posting from the hospital...
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MerleApAmber
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Posted Fri May 3, 2013, 12:14pm
Subject: Re: Microwave Superheating Warning - Public Service Announcement
 

I've seen this with whole milk, adding splenda and cocoa after heating. Any time you're at or above boiling temperature, adding more nucleation points can cause more vapor sites => ^ Boiling.
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Taryl
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Posted Tue May 14, 2013, 4:10pm
Subject: Re: Microwave Superheating Warning - Public Service Announcement
 

A worthy PSA!  I don't think folks realize how microwaves actually heat things up, let alone how a surface like porcelain or glass responds.  I've nearly branded myself on the edge of the wrong plate with no hot mitts, and spurting boiling water could blind someone quite easily.

+1!
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