The fact that hot water freezes more quickly than cold water is known as what?
Mpemba effect 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. The Mpemba effect is named after Erasto Batholomeo Mpemba (b.1950) who discovered it in 1963. There were preceding ancient accounts of similar phenomena, but lacking sufficient detail to attempt verification. The phenomenon, when taken to mean "hot water freezes faster than cold", is difficult to reproduce or confirm because this statement is ill-defined. Monwhea Jeng proposes as a more precise wording: There
Instant hot water dispenser but also instant hot water dispensers do not 'keep warm' nor 'reboil'. In fact, it furthers provide the convenience that users need not switch off the appliance when not in use. In many cases the alternative is to heat water in, say, a kettle. If only the amount of water needed is heated, energy usage is less: the same energy is used for heating [needs clarification: only true if the kettle and the dispenser have the same thermal transfer, which is very unlikely], but none for keeping hot. If more water than needed is boiled in a kettle, energy is