Is it true that hot water freezes faster than cold water?

Hot water freezes faster than cold, known as the Mpemba effect. The Mpemba effect occurs when two bodies of water with different temperatures are exposed to the same subzero surroundings and the hotter water freezes first.

Does hot water freeze faster than cold water Mythbusters?

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.

Why does cold water come out faster than hot?

the driving force is mains pressure, and there is no storage, but the water has to flow through a restricted path (and often a flow regulator) while it is being heated – flow too quickly and it won’t get as hot.

Why do hot water lines freeze before cold water lines?

Hot water pipes are more likely to burst than cold water pipes because the initially higher temperature of the water in them makes the formation of ice crystals more difficult. The water in the pipe then supercools, that is, goes below 0°C (32°F).

Does hot water freeze faster in the freezer?

Hot water can in fact freeze faster than cold water for a wide range of experimental conditions. This phenomenon is extremely counterintuitive, and surprising even to most scientists, but it is in fact real. The phenomenon that hot water may freeze faster than cold is often called the Mpemba effect.

Why does hot freeze faster than cold?

The Mpemba effect is the observation that warm water freezes more quickly than cold water. Hence the faster freezing. Another is that warm water evaporates rapidly and since this is an endothermic process, it cools the water making it freeze more quickly.

Does hot water freeze faster than cold water?

It’s an age-old question with a simple answer: no. Since the time of Aristotle, researchers and amateur scientists alike have batted about the counterintuitive theory that hot water freezes faster than cold.

What happens to the rate of heat transfer when you freeze?

Interestingly, he points out, the rates of change in this experiment will not be the same. “When you set them in the freezer, the freezer will work harder to bring the temperature of the hot water down, so initially the rate of heat transfer will be faster in the hot water.”

What is the freefreezing experiment?

Freezing was official when sensors picked up an electrical signal created by ice formation. Brownridge heated the tap water to about 100° C, while the distilled water was cooled to 25° C or lower. When both samples were put into the freezer, the hot water froze before the cold water.

Why does distilled water freeze faster than tap water?

Differences in the shape, location and composition of impurities can all cause water’s freezing temperature — which in many cases is below zero degrees C — to vary widely. With a higher freezing point, the tap water had an edge that outweighed the distilled water’s lower temperature.