# Investigatory Project

Topics: Freezing, Mpemba effect, Water Pages: 4 (1154 words) Published: February 20, 2013
nves
Title of the Project:

Frozen Hot Ice Cream

Rationale:

We have encountered a phenomenon that states that the hotter liquid freezes faster than cold liquid. This phenomenon has been known for a long time, but was rediscovered by a Tanzanian high school student, Erasto Mpemba, in the 1960s. He and his classmates were making ice cream, using a recipe that included boiled milk. The students were supposed to wait for the mixture to cool before putting it in the freezer. The remaining space in the freezer was running out, and Mpemba noticed one of his classmates put his mixture in without boiling the milk. To save time and make sure that he got a spot in the freezer, Mpemba put his mixture in while it was still hot. He was surprised to find later that his ice cream froze first. When Mpemba later asked his teacher for an explanation of how his hotter ice cream mixture could freeze before a cooler one, the teacher teased him, "Well all I can say is that is Mpemba physics and not the universal physics" (quote in Jeng, 2005). Mpemba followed his curiosity and did more experiments with both water and milk, which confirmed his initial findings. He sought out an explanation for his findings from a visiting university professor, Dr. Osborne. Work in Dr. Osborne's lab confirmed the results, and Mpemba and Osborne described their experiments in a published paper (Mpemba and Osborne, 1969). We would like to investigate further and find out for ourselves that, will hot liquid freeze faster than cold liquid.

Objectives of the study:

• The goal of this project is to investigate the question, "Can hot water freeze faster than cold water?" • In the end of this experiment we may be able to:

o To determine which one will freeze first, the hot water or the cold water.

o To know the effect of heat in freezing liquids.

o To explain the happenings in the experiment.

Hypothesis:

Maybe, the cold water...

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