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From: fred@mnetor.UUCP (Fred Williams)
Newsgroups: net.cooks
Subject: Re: Why boil cold water
Message-ID: <580@mnetor.UUCP>
Date: Mon, 13-May-85 09:50:19 EDT
Article-I.D.: mnetor.580
Posted: Mon May 13 09:50:19 1985
Date-Received: Mon, 13-May-85 10:21:51 EDT
References: <707@dedalus.UUCP> <7285@Glacier.ARPA>
Reply-To: fred@mnetor.UUCP (Fred Williams)
Organization: Computer X (CANADA) Ltd., Toronto, Ontario, Canada
Lines: 33
Summary: 

In article <7285@Glacier.ARPA> reid@Glacier.ARPA (Brian Reid) writes:
>>      There is actually a scientific reason to boil cold water as opposed to
>> hot (it may not be the pertinent reason, though).  Cold water will boil
>> FASTER (yep, that's right) than hot water.  This is because the cold water
>> contains more oxygen than the hot water (now what that does is beyond me).
>> The above strange fact was passed on to the freshman chemistry class I took
>> in college.
>
>I remain deeply skeptical. So much so, in fact, that I went in to my kitchen
>just now and did an actual experiment. (details of experiment at end of
>message for those who care). 
>----------------------------------------------------------------------------

	I am amazed that someone actually wasted time doing this.

>	     Initial  Time to   Kilojoules   joules/ <-- you can think of
>	      temp     boil      absorbed    second    this number as the
>Hot water     60F      204sec      184        901     "boiling efficiency"
>Cold water   135F      365sec      347        950
>----------------------------------------------------------------------------
>
>The summary result is that hot water boils faster than cold water, as one
>might have expected. A joule/second is a watt, so what this means is that my
>1200-watt burner was delivering 901 watts to the hot water and 950 watts to
>the cold water. The probable explanation for this is that the energy
>transfer rate levels off sharply as the water approaches boiling, because of
>evaporative loss, and that the cold water stays in the high-efficiency range
>for a larger percentage of the total time. . . .

	Newton's law of cooling describes this well. Does anyone
	I don't mean to be insulting to anyone, but really!

Cheers,		Fred Williams