Abstract

Will hot water freeze faster than cold water even if impurities are added?

Aim of Experiment

Mpemba effect is a phenomenon where hot water freezes faster than cold water.
In our experiment, we will test the Mpemba effect, as well as the factor of which if added impurities to both hot and cold water will affect the Mpemba effect.

Our Hypothesis

Our hypothesis is that even with impurities, hot water will still freeze faster than cold water. In history, Mpemba noticed this phenomenal with his ice cream. Ice cream has impurities in it and thus, we reached a conclusion for our hypothesis that even with added impurities, Mpemba effect will continue to take place.

Methods

To test this, we used water of 90ºC and 60ºC. We froze them without impurities as a control, and 2 other similar set-ups, each adding impurities in them (salt and sugar). We recorded the results of the hot and cold water each and stopped recording when either of the hot or cold water froze.

Results

From our experiments, we have observed that hot water does freeze faster than cold water only when certain conditions are met. When we tried out a lower temperature such as 50ºc and 30ºc or 90ºc and 30ºc, the Mpemba effect did not take place. When sugar was added into both hot and cold water, Mpemba effect took place. But when salt was added, The Mpemba effect did not take place.

Conclusion

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