Mpemba effect provides a marvelous concrete example of how important it is to test even the most common sense theories by experiment, and how difficult quantification and a complete characterization of even the simplest results can be. The mpemba effect is the name given to the assertion that it is quicker to cool water to a given temperature when the initial temperature is higher this assertion seems counter-intuitive and yet references to the effect go back at least to the writings of aristotle indeed, at first thought one. Our results show that the mpemba effect is a generic non-equilibrium phenomenon that appears if the evolution of temperature depends on other physical quantities that characterise the initial state of the system, says santos. Erasto mpemba was at mkwawa high school, tanzania, in 1966 when he asked dr osborne why hot water froze more quickly than water starting at a lower temperature the claimed effect was studied in.
If true, this could explain the mpemba effect because the initially cold water would need to do more work — that is, get colder — in order to freeze but this also cannot be considered the sole explanation of the mpemba effect. The mpemba effect is a special phenomenon where hot water freezes faster than cold water the discovery of this effect was made by a high school student named mpemba in tanzania, africa in 1969 he noticed this phenomenon while making ice cream and was curious enough to make note of it. Over the years many scientists have puzzled over a counter-intuitive observation: hot water, for some reason, seems to freeze faster than cold water.
(in fact, the effect has been noted by many scientists throughout history including aristotle, francis bacon and rené descartes) the mpemba effect is the observation that warm water freezes more quickly than cold water. The mpemba effect, named after erasto mpemba, is the observation that, in some circumstances, warmer water can freeze faster than colder water although there is evidence of the effect, there is disagreement on exactly what the effect is and under what circumstances it occurs there have been. Evaporation is the strongest candidate to explain the mpemba effect as hot water placed in an open container begins to cool, the overall mass decreases as some of the water evaporates.
Sometimes hot water can freeze into ice quicker than cold water this is thanks to an unusual phenomenon called the mpemba effect it might seem counterintuitive, but it's ancient knowledge. The mpemba effect and its reverse (a cooler sample may heat faster than a hotter sample) have been shown, by theory and computation, to exist in the simple system of a uniform granular fluid the rationale for this is that some particles may be given more energy than others, even if the mean temperature is unchanged a theory that fits even better with the 2-state hypothesis for water. The mpemba effect the mpemba effect is the phenomenon where hot water freezes quicker than cold water the royal society of chemistry offered £1000 to the person or team producing the best and most creative explanation as to why this occurs.
The mpemba effect is relevant in our group's science fair project because it shows an efficient example of how a certain kind of matter, liquid, can undergo tremendous amount of changes in a small amount of time due to temperature changes (ouellette and zivkovic 109. The effect is named after its discoverer - erasto mpemba, who as a teenager went to school in tanzania in the 1960s during cookery lessons, he was taught to make ice cream by heating milk and sugar together on a stove, then leave the mixture to cool before putting it in the freezer to set. Mpemba actually tried it, got the same effect, asked people who froze things for a living (and was told that they knew about the result), and then refused to be told that the effect didn't happen, by people who hadn't actually tried it. (physorgcom) -- scientists have known for generations that hot water can sometimes freeze faster than cold, an effect known as the mpemba effect, but until now have not understood why several theories have been proposed, but one scientist believes he has the answer. The mpemba effect what would you say if i told you that sometimes, warm water freezes faster than cold water well, it happens, and this strange phenomena is called the mpemba effect.
The phenomenon mpemba found is now known as the mpemba effect and is the very counterintuitive idea that, under certain circumstances, a quantity of very hot liquid can freeze faster than an equal. Simply stated, the mpemba effect is the name given to the phenomenon when hot water freezes more quickly than cold water although the effect has been observed for centuries, it was not published as a scientific observation until 1968. Now physicists are pointing to strange properties of hydrogen bonds as the solution to one of the oldest mysteries in physics - but others are claiming the so-called mpemba effect doesn't even exist at all. The mpemba effect went relatively unnoticed throughout early human history references by aristotle and rené descartes demonstrate a vague awareness of art by rachel lawrence boiling water freezes more quickly than does water at room temperature.
The mpemba effect is the phenomenon of hot water freezing faster than cold water this occurrence was discovered in 1969 by a high school student named erasto mpemba in tanzania due to the extremely counterintuitive nature of this finding, most scientists were surprised by mpemba's discovery. The mpemba effect is a process in which hot water can freeze faster than cold water the phenomenon is temperature-dependent the phenomenon is temperature-dependent there is disagreement about the parameters required to produce the effect and about its theoretical basis. At that time, he was ridiculed by his teacher and told that he was mistaken, but mpemba was one determined high school student 6 years later, in 1969, he published the results of his findings today, this phenomenon is known to the whole world as the mpemba effect.
Abstract this physics project seems like it should have an easy answer instead, it turns out to be a great illustration of why it is important to base scientific conclusions on the outcome of controlled experiments. It has the modern name of the mpemba effect, named for erasto mpemba, a tanzanian high school student with an interesting story in 1963, mpemba's class was dissolving sugar in boiling milk to. Testing the mpemba effect ,when hot water freezes before cold water, under normal conditions in a kitchen with an oven and freezer this project is used to sample temperatures of two different containers.