Written on December 24th, 2007 by Oliver Kim
Categories: All Articles, Areas of Knowledge, Logics / Reason, Science, Sense Perception, Ways of Knowing
In this edition I would like to explain why hot water freezes faster than cold water, when put into the freezer. It is a very counter-intuitive observation, it’s a paradox. This is called the Mpemba Effect. The effect is named according to Tanzanian high-school student Erasto B. Mpemba who re-discovered the effect while making ice-cream, back in 1963. The Mpemba Effect is a nice example how the change of one variable, the temperature, can have unexpected side effects. Most people assume that the difference between a hot glass of water and a cold glass of water is only the temperature. But this is not the case. Just by heating the water we are introducing a range of other variables that have an unexpected effect on the outcome.
In this edition of TOK-Talk I would like to explain why hot water freezes faster than cold water, when put into the freezer. How is this possible? Listen to find out! Continue reading » Tags: All Articles, Areas of Knowledge, Areas of Knowledge, Logics / Reason, Mpemba, Science, Science, Sense Perception, variables, Ways of Knowing