T0=26.1, R0=89300, T=193.0, R=310.661, ln(R/R0)/((1/(T+273.15))-(1/(T0+273.15)))

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.