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I recently completed an experiment trying to find the critical temperature of a bismuth based ceramic material. I cooled the sample using liquid nitrogen. I have attached my results in an excel file, where I had to plot the sample voltage (Vs) against thermocouple voltage(Vt). My question is, how do you measure the critical temperature from the graph. I was thinking it is the point where the graph gets rather steep. Any help would be appreciated.

Thanks

ps: the scale is mV

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# Find the critical temperature of a bismuth based ceramic

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