On Jan 19, 12:37 am, meekerdb <[email protected]> wrote: > On 1/18/2012 11:13 AM, Evgenii Rudnyi wrote: > > > > > > > > > > > On 18.01.2012 18:47 John Clark said the following: > >> On Sun, Jan 15, 2012 at 3:54 PM, Evgenii Rudnyi<[email protected]> > >> wrote: > > >> " Some physicists say that information is related to the entropy" > > >> That is incorrect, ALL physicists say that information is related to > >> entropy. There are quite a number of definitions of entropy, one I > >> like, although not as rigorous as some it does convey the basic idea: > >> entropy is a measure of the number of ways the microscopic structure > >> of something can be changed without changing the macroscopic > >> properties. Thus, the living human body has very low entropy because > >> there are relatively few changes that could be made in it without a > >> drastic change in macroscopic properties, like being dead; a bucket > >> of water has a much higher entropy because there are lots of ways you > >> could change the microscopic position of all those water molecules > >> and it would still look like a bucket of water; cool the water and > >> form ice and you have less entropy because the molecules line up into > >> a orderly lattice so there are fewer changes you could make. The > >> ultimate in high entropy objects is a Black Hole because whatever is > >> inside one on the outside any Black Hole can be completely described > >> with just 3 numbers, its mass, spin and electrical charge. > > >> John K Clark > > > If you look around you may still find species of scientists who still are > > working with > > classical thermodynamics (search for example for CALPHAD). Well, if you > > refer to them as > > physicists or not, it is your choice. Anyway in experimental thermodynamics > > people > > determine entropies, for example from CODATA tables > > >http://www.codata.org/resources/databases/key1.html > > > S ° (298.15 K) > > J K-1 mol-1 > > > Ag cr 42.55 ą 0.20 > > Al cr 28.30 ą 0.10 > > > Do you mean that 1 mole of Ag has more information than 1 mole of Al at > > 298.15 K? > > Yes, it has more internal degrees of freedom so that it takes addition of > more energy in > order to increase those we measure as temperature.
This suggests to me that a molecule of DNA belonging to a kangaroo could have no more information than the same molecule with the primary sequence scrambled into randomness or 'blanked out' with a single repeating A-T base pair. That would seem to make this definition of information the exact opposite of the colloquial meaning of the term. A blank hard drive could have more information as one full of billions of documents if the platters were at a different temperatures? Craig -- You received this message because you are subscribed to the Google Groups "Everything List" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/everything-list?hl=en.
