Re: 70 to 25 in 48 hours, moving air, water
- To: <perennials@mallorn.com>
- Subject: Re: 70 to 25 in 48 hours, moving air, water
- From: "* L* <h*@mindspring.com>
- Date: Thu, 12 Mar 1998 20:03:47 -0500
For what its worth, one must absorb 1 calorie of heat to lower the
temperature of 1 gram of water by 1 degree. But it takes the absorption of
80 calories of heat to freeze that gram to ice, and it gives back off 80
calories again when it melts. When the gram of water is coating a bud, the
bud gets the benefit of the 80 calories before either the water or the bud
can freeze.
-----Original Message-----
From: dorsett <dorsett@kiva.net>
To: perennials@mallorn.com <perennials@mallorn.com>
Date: Thursday, March 12, 1998 7:20 PM
Subject: Re: 70 to 25 in 48 hours, moving air, water
>>Isn't this what's called sublimation/
>
>Nope. Sublimination is when a material goes directly from a solid to a
>gaseous state...like dry ice turning into gaseous carbon dioxide.
>
>>At any rate, you intuitively know this. Take a glass of water that's
>>been in the fridge and is below 40F. Take a glass of water that's been
>>sitting on the counter at 70F. Put in freezer. It takes a *heck* of a
>>long time to freeze the 40F water -- much longer than bringing the 70F
>>down to 40F. Same goes from moving the Thanksgiving turkey into the
>>fridge from the freezer -- takes *forever* to thaw.
>
>That's heat of fusion.....the stage where water turns into ice (and ice
>into water) stores up (or releases) a few calories of energy during the
>process of changing between solid and liquid states of matter.
>
>Barb in Southern Indiana Zone 5/6 <dorsett@kiva.net>
> Midwest Gardener http://www.suite101.com/topics/page.cfm/430
> Suite 101 http://www.suite101.com
> Gardening splash page
http://www.suite101.com/userfiles/79/gardening.html
> A root is a flower that disdains fame.
>
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