Rick Karlquist wrote: > Bruce Griffiths wrote: > >> Mark Sims wrote: >> >>> Remember that heat flow is proportional to the FOURTH power of the >>> temperature difference. Insulation is generally a linear function. The >>> combination makes thermal stabilization over even small ambient >>> temperature ranges rather problematic. >>> >>> >>> >>> >> Nonsense. >> The radiative transfer between 2 bodies at different temperatures is >> proportional to the difference between the 4th powers of their absolute >> temperatures. >> > > And this quantity is approximately equal to the THIRD power of > the temperature difference for small temperature differences. > (A simple calculus problem!) > > Rick Karlquist N6RK > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > Rick
For small temperature differences its always linearly proportional to the temperature difference not its third power. Heat radiation is proportional to (T2)^4 - (T1)^4 which for small T2-T1 ~ (T2-T1)*T^3 where T ~ T1~T2 and T2-T1 is small. Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
