Mpemba Effect

https://www.sciencenews.org/article/debate-heats-over-claims-hot-water-sometimes-freezes-faster-cold
 EMILY CONOVER JANUARY 6, 2017


Summary:

We have all been told that hot water freezes faster than cold water, however this may not be completely true. In the 1960s a student discovered that hot cream would turn to ice cream quicker than warm. This was named the Mpemba effect, named after the student. For years it has been believed, however this is now being challenged. Scientists are asking if it even makes sense. Many factors have been tested and none have contributed to the cold water freezing faster. Some researchers are questioning if the effect is even real. They believe that the temperature of water does not determine how quickly it freezes. Scientists from Imperial College London have observed the time it takes for cold and hot water to freeze and have not seen any evidence towards the Mpemba effect. The question is still up for debate.

Discussion:

The situation in this article has little to no impact on our lives. However it is a very interesting debate between two sides. Ever since I was young I thought hot water froze faster than cold. I did not know why or care why it was just something I, as well as many other kids, were told. I do not know if I believe the Mpemba effect is true or not. When you throw hot water onto a cold surface it freezes faster than cold. However when you put ice cube trays in a freezer neither cold or hot freezes faster. I believe the Mpemba effect relies on many different variables and therefore is not a real effect. Sorry Mr. Mpemba. Whichever side science proves to be correct this topic will make for a good discussion. It will be neat to find out if this childhood fun is a myth or fact.