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In efforts to determine phase transitions in the disintegration of highlyexcited heavy nuclei, a popular practice is to parametrise the yields ofisotopes as a function of temperature in the form$Y(z)=z^{-\tau}f(z^{\sigma}(T-T_0))$, where $Y(z)$'s are the measured yieldsand $\tau, \sigma$ and $T_0$ are fitted to the yields. Here $T_0$ would beinterpreted as the phase transition temperature. For finite systems such asthose obtained in nuclear collisions, this parametrisation is only approximateand hence allows for extraction of $T_0$ in more than one way. In this work welook in detail at how values of $T_0$ differ, depending on methods ofextraction. It should be mentioned that for finite systems, this approximateparametrisation works not only at the critical point, but also for first orderphase transitions (at least in some models). Thus the approximate fit is noguarantee that one is seeing a critical phenomenon. A different but moreconventional search for the nuclear phase transition would look for a maximumin the specific heat as a function of temperature $T_2$. In this case $T_2$ isinterpreted as the phase transition temperature. Ideally $T_0$ and $T_2$ wouldcoincide. We invesigate this possibility, both in theory and from the ISiSdata, performing both canonical ($T$) and microcanonical ($e=E^*/A$)calculations. Although more than one value of $T_0$ can be extracted from theapproximate parmetrisation, the work here points to the best value from amongthe choices. Several interesting results, seen in theoretical calculations, areborne out in experiment.Comment: Revtex, 10 pages including 8 figures and 2 table

Tracking the phase-transition energy in the disassembly of hot nuclei