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I did an experiment investigating the Mpemba effect and I found that a contributing factor to why hot water freezes faster than cold water is due to the amount of time the water takes to freeze. As in during a phase change, the water stays at a constant temperature until the whole thing freezes, so once the whole thing freezes, the temperature starts to drop, so from the point where it hits the freezing temperature to the point just before the temperature drops is what I'm referring to.

I found that in the cooler temperatures, it stayed at the "freezing stage" for longer than the hotter water. I can't really find an explanation online as to what actually happens during this stage and what can affect the time it takes to complete this stage.So I'm just curious to know if there's anything which affects this stage.

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  • $\begingroup$ How much ice did you end up with? $\endgroup$
    – Jon Custer
    Mar 21, 2021 at 19:40
  • $\begingroup$ @JonCuster I did it in small batches and each sample was 50ml and after every sample, I just dumped the ice into the sink, so I don't really know how much $\endgroup$
    – prata
    Mar 21, 2021 at 19:59
  • $\begingroup$ The reality of the Mpemba effect is in fact hotly disputed: nature.com/articles/srep37665 and should not be taken for granted. $\endgroup$
    – Gert
    Mar 21, 2021 at 21:25
  • $\begingroup$ Nature: We conclude that despite our best efforts, we were not able to make observations of any physical effects which could reasonably be described as the Mpemba effect. Moreover, we have shown that all data (with the only exceptions coming from a single study) reporting to be observations of the Mpemba effect within existing studies fall just above the Mpemba effect line, i.e. the difference in the cooling times between the hot and cold samples is marginal. $\endgroup$
    – Gert
    Mar 21, 2021 at 21:44
  • $\begingroup$ We have shown (Fig. 3) that much of the data reporting to be observations of the Mpemba effect were from studies not reporting the height at which temperatures were measured7,14,20,21,22,23 and that the conclusions drawn from these data could have been altered by simply recording temperatures without precisely monitoring the height. Indeed, all the data which lie just above the Mpemba effect line in Fig. 3 (including data for which the temperautre measurement height was carefully monitored and reported17,24,28) are, [...] $\endgroup$
    – Gert
    Mar 21, 2021 at 21:45

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