Is Mpemba effect fake?
Under our definition of the Mpemba effect, akin to the definition in the ‘original’ paper by Mpemba & Osborne8 (in which they documented “the time for water to start freezing”) we are forced to conclude that the ‘Mpemba effect’ is not a genuine physical effect and is a scientific fallacy.
What does the Mpemba effect explain?
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.
What did Mpemba discover?
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 quantity of cold liquid.
Does hot water freeze faster than cold Reddit?
If the water is initially hot, cooled water at the bottom is denser than the hot water at the top, so no convection will occur and the bottom part will start freezing while the top is still warm. This effect, combined with the evaporation effect, may make hot water freeze faster than cold water in some cases.
Is the Mpemba effect real Reddit?
The Mpemba effect isn’t real; hot water doesn’t cool or freeze faster than cold : r/chemistry.
What is the Mpemba effect for kids?
From Academic Kids. The Mpemba effect is the somewhat surprising phenomenon whereby hot water can, under certain conditions, freeze faster than cold water. The effect is named for its rediscoverer, the Tanzanian high-school student Erasto B. Mpemba.
Why does warm water make you pee?
But for swimmers, full body immersion really can increase the amount of water, salts, and urea (a waste product found in urine) that your body releases. When you combine cold temps and this hydrostatic pressure, that’s a recipe for making noticeably more pee.
How do you pronounce Mpemba?
- Phonetic spelling of Mpemba. mpem-ba. Mem-pem-ba. pem-ba.
- Meanings for Mpemba.
- Examples of in a sentence. Mpemba, Songwe, Tanzania Weather Conditionsstar_ratehome. Mpemba, Tanganyika, Democratic Republic of the Congo Precipitation Forecaststar_ratehome.
- Translations of Mpemba. Chinese : 姆潘巴
Is the mpemba effect real Reddit?
Does 100 Pure water freeze?
“Contrary to popular perception, pure liquid water does not usually freeze at its melting point, 0°C, and can instead supercool to temperatures as low as -38°C.
Is peeing in the ocean OK?
Peeing in the ocean is totally fine, but don’t pee in protected areas like reefs or smaller bodies of water, especially swimming pools.
What is KF water?
The molal freezing point depression constant for H2O, Kf , is given as 1.86 °C.kg/mole. Thus a1. 00 m aqueous solution freezes at -1.86 °C instead of 0.00°C which is the normal freezing point for water.
What is Mpemba effect in biology?
Mpemba effect. The Mpemba effect is a process in which hot water can freeze faster than cold water. The phenomenon is temperature-dependent. There is disagreement about the parameters required to produce the effect and about its theoretical basis.
What is Mpemba’s observation?
Mpemba’s observation. The effect is named after Tanzanian Erasto Mpemba. He described it in 1963 in Form 3 of Magamba Secondary School, Tanganyika, when freezing ice cream mix that was hot in cookery classes and noticing that it froze before the cold mix. He later became a student at Mkwawa Secondary (formerly High) School in Iringa.
What affects the probability of observing the Mpemba phenomenon?
In a related study, it was found that freezer temperature also affects the probability of observing the Mpemba phenomenon as well as container temperature. While the actual occurrence of the Mpemba effect is a matter of controversy, several theoretical explanations could explain its occurrence.
What is the best temperature to do the Mpemba experiment?
New Scientist recommends starting the experiment with containers at 35 and 5 °C (95 and 41 °F) to maximize the effect. In a related study, it was found that freezer temperature also affects the probability of observing the Mpemba phenomenon as well as container temperature.