From owner-metabolic-reg@net.bio.net Mon Jan 03 22:00:00 1994
Path: biosci!daresbury!doc.ic.ac.uk!uknet!pipex!howland.reston.ans.net!xlink.net!gmd.de!dearn!barilvm!vms.huji.ac.il!marder.agri.huji.ac.il!MARDER
Newsgroups: bionet.metabolic-reg
Subject: Re: Photosynthesis: exothermic or endothermic?
Message-ID: <MARDER.117.2D29A1BB@agri.huji.ac.il>
From: MARDER@agri.huji.ac.il (Jonathan B. Marder)
Date: Tue, 4 Jan 1994 17:04:59 GMT
References: <2gbed2$sje@mserv1.dl.ac.uk>
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In article <2gbed2$sje@mserv1.dl.ac.uk> John Woods <eanv20@castle.ed.ac.uk>
writes:
>And I'm still not sure whether
>photons count as thermal energy or not.
>                                        ... John Woods

Photons definitely DO NOT count as thermal energy.  Thermal energy is the
*internal* energy of a substance which is due to vibrations/movements within
the substance.  You cannot have thermal energy in a vacuum, and photons
definitely exist in a vacuum.


__
Jonathan B. Marder                 '
Department of Agricultural Botany  |     Internet: MARDER@AGRI.HUJI.AC.IL
The Hebrew University of Jerusalem | /\/ Bitnet:   MARDER@HUJIAGRI
Faculty of Agriculture             |/  \ Phone:    (08 or +9728) 481918

.