Hi Simple answer: conductivity. You don’t get much heat capacity either way.
Bob > On Oct 30, 2020, at 5:49 PM, Attila Kinali <att...@kinali.ch> wrote: > > Moin, > > I have been looking at heat capacities of different materials > lately. One thing that struk me odd is, that the volumetric > heat capacity of copper, which is the thing that most people > use when building something that needs to have high heat capacity > to get stable temperature, has only a volumetric heat capacity > of 3.45 J/(cm^3·K). Meanwhile, the much cheaper iron has > a volumetric heat capacity of 3.53 J/(cm^3·K) and steel > even 3.75 J/(cm^3·K). > > In an OCXO, which is generally size limited, getting the most > heat capacity in the limited volume would be the main goal, > wouldn't it? Also optimizing for price would be a major thing. > I can understand that iron is probably not the right choice > due to its tendency to oxidize. But using a soft (annealed) steel > would be easy to machine, cheaper per piece and give almost 10% > higher heat capacity in the same volume. > > So why do people choose copper instead of steel? > > > Attila Kinali > > PS: Fun fact: Water has a volumetric heat capacity of 4.18 J/(cm^3·K) > at 25°C. We should fill OCXOs with water! :-D > > -- > <JaberWorky> The bad part of Zurich is where the degenerates > throw DARK chocolate at you. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.