[Homeroast] Distilled H2O

Andy Thomas adt0611 at yahoo.com
Thu Jun 6 00:15:53 CDT 2013

It is a pretty common occurrence when boiling water in a microwave oven. The water can become supper-heated, that is, hotter than boiling temperature, and then suddenly it will boil explosively. It has happened to me a few times.


 From: Frank Parth <fparth at me.com>
To: "A list to discuss home coffee roasting. There are rules for this list, available at http://www.sweetmarias.com/maillistinfo.html" <homeroast at lists.sweetmariascoffee.com> 
Sent: Wednesday, June 5, 2013 9:02 PM
Subject: Re: [Homeroast] Distilled H2O

On Jun 5, 2013, at 9:06 AM, Raybob Bowman <raybob at tube-tone.com> wrote:

> On 6/4/2013 7:18 PM, homeroast-request at lists.sweetmariascoffee.com wrote:
>> Subject: Re: [Homeroast] Distilled H2O
>> Message-ID:<51AE2D6D.6050403 at sbcglobal.net>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>> Any of us lab rats will tell you that boiling pure distilled water is
>> dangerous as it can "bump" or "explode" for lack of particulate surface
>> around which to form vapor bubbles.  Be very careful.  In a metal boiler
>> chamber there should be sufficient surfaces to prevent that, but you
>> never know.
> Dude, I've been boiling distilled water usually twice a day for well over 20 years now.  I've never heard of such a thing.  …
> Raybob

When I was studying chemistry back in college (many years ago) I was taught the same thing. For water to boil there must be something for the bubbles to form on. 


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