Why do hot water pipes freeze faster than cold?

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.

What is it called when 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.

Why did the hot water mix faster than the cold water?

Energy from hot water molecules makes solids more soluble. In hot water, molecules are moving around more, so there are more collisions between the water molecules and a solid.

Does hot water flow faster than cold?

Water is made of molecules (two hydrogen atoms and one oxygen atom stuck together). Warm water has more energy than cold water, which means that molecules in warm water move faster than molecules in cold water.

What causes the Mpemba effect?

His experiments revealed that the Mpemba effect occurs when ice crystals appear in a supercooled liquid at higher temperatures, which means that, in such cases, hot water would appear to freeze first.

Why hot liquids flow faster than cold liquids?

It is so because the temperature of hot liquid is high which decreases the viscosity As decrease of viscosity takes place with increase of temperature so hot liquid moves faster than the cold one.

Is hot water lighter than cold?

Like air, water expands as it gets warmer and as a result becomes less dense. Water is most dense at temperatures near freezing. When water freezes, however, it expands, becoming less dense. F) and hot water are compared, cold water weighs more than hot water.

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.”

Why do some things freeze faster than others?

One idea is that warm containers make better thermal contact with a refrigerator and so conduct heat more efficiently. 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.

Which water freezes first?

Often, the water with a higher starting temperature was the first to freeze. Their observations set off a decades-long discussion over the existence and details of the counterintuitive phenomenon, now called the Mpemba effect.