Question: Does Hot Water Freeze Faster Than Cold Water?

Which water will freeze faster?

The Mpemba effect is the observation that warm water freezes more quickly than cold water.

The effect has been measured on many occasions with many explanations put forward.

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

Hence the faster freezing..

Does hot water kill germs?

Hot water kills germs, though it has to be very hot According to WHO, temperatures of 140°F to 150°F are enough to kill most viruses, and boiling water makes it safe from pathogens like bacteria, viruses, and protozoa.

Which freezes faster saltwater or freshwater?

Salt water freezes at a lower temperature than the 32 degrees F at which freshwater freezes. The difference between the air temperature and the freezing point of salt water is bigger than the difference between the air temperature and the freezing point of freshwater. This makes the ice with salt on it melt faster.

Does hot water freeze faster than cold water results?

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.

Can hot water freeze faster than cold water science buddies?

Since Mpemba and Osborne’s paper was published many scientists have tried to replicate their findings. In some cases people have seen the Mpemba effect, in other cases the hotter water does not freeze faster. … Somehow, the hot water must be able to lose its heat faster than the cold water.

What boils faster hot or cold water?

Answer and Explanation: Hot water boils faster than cold water. While cold water will absorb heat much faster than hot water, hot water will reach a boil sooner than cold…

Why do hot and cold water not mix?

When you heat up water, the water molecules start moving around faster and faster. … So hot water is less dense than cold water. When you put the two together with the hot water on the bottom, the hot water rises to the top, mixing with the cold water along the way and creating purple water.

What temp does ice melt?

32°FThe melting point is the temperature at which a solid turns to a liquid. The melting point at which ice — a solid — turns to water — a liquid — is 32°F (0°C).

How does the mpemba effect work?

Theories for the Mpemba effect have included: faster evaporation of hot water, which reduces the volume left to freeze. formation of a frost layer on cold water, insulating it. different concentrations of solutes such as carbon dioxide, which is driven off when the water is heated.

Why does water freeze faster than other liquids?

Water will freeze faster than liquids with salt or sugar in them. Some liquids freeze faster than others because of viscosity, or thickness of the liquid. Viscosity is the resistance of a liquid to flow. For instance, a cup of honey will take longer to pour than a cup of water because the honey has higher viscosity.

Can salt water freeze?

Ocean water freezes just like freshwater, but at lower temperatures. Fresh water freezes at 32 degrees Fahrenheit but seawater freezes at about 28.4 degrees Fahrenheit , because of the salt in it. When seawater freezes, however, the ice contains very little salt because only the water part freezes.

What is the warmest temperature it can frost?

Q: Can frost occur at temperatures above 32°F? A1: No, frost is defined as a layer of ice that forms on surfaces that are at or below 32°F.

Does cold water boil faster than hot water Reddit?

“Cold water does not boil faster than hot water. … As a result, cold water will be absorbing heat faster while it is still cold; once it gets up to the temperature of hot water, the heating rate slows down and from there it takes just as long to bring it to a boil as the water that was hot to begin with.

Is the mpemba effect real?

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.