Think about it this way...
If you start out with hot water, it has to cool its freezing temperature before it will freeze. Somewhere along the process it will become the same temperature as "cold" water - whatever temperature you choose to define as "cold". It takes time to reach that "cold" temperature and from the point that it becomes cold until it freezes should be the same as it was for water that started out "cold". All else being equal, cold water will freeze faster than hot water.
Notice that I said "all else being equal". There are situations where water that starts out hot may freeze faster than the cold water. As an example - if you fill two ice trays with water - one with cold water and one with hot - and stick them into the freezer, the hot tray will start melting any frost or ice it is placed on. As it does so, it provides better contact with a cold surface that will act as a heat sink as it cools down. Having formed this better contact, it will begin to cool through both conductive and convective heat transfer. The tray that started out cold but which has poor thermal contact with its surroundings mainly cools by convection. Because conductive heat transfer is usually faster than convective heat transfer, the initially hot tray may catch up to the temperature of the initially cold tray and then continue to cool faster because of the boost from conductive heat transfer. Notice that the conditions have to be right for this to occur - the hot tray has to be warm enough to do the melting and establish the good surface-to-surface contact for the conductive heat transfer; there has to be frost or ice for it to be melting, the cold tray can't be too cold or it will start freezing before the hot tray catches up; likewise, the hot tray can't be too hot or it won't catch up to the cold tray; the freezer can't have too much forced convection (fan blowing in the freezer) but rather be primarily natural convection; the cold tray can't be warm enough to melt the ice or frost like the hot tray.
The purpose of conducting the "Does hot water freeze faster than cold water" project is to investigate and understand the phenomenon known as the Mpemba effect, which suggests that hot water can freeze faster than cold water under certain conditions. This project aims to explore this concept and potentially uncover new insights into the freezing process of water.
Cold water, being the closest to freezing point, will obviously freeze the fastest. Hot water will freeze the second fastest, and salt water barely ever freezes, except in very cold conditions.
The time it takes for hot water to freeze depends on factors such as the initial temperature of the hot water and the surrounding temperature. In general, hot water will freeze faster than cold water due to the Mpemba effect, which is the phenomenon where hot water freezes faster than cold water under certain conditions.
In some cases, hot water can freeze faster than cold water due to the Mpemba effect. This phenomenon occurs because hot water can evaporate more quickly, which reduces the volume of the water and leads to faster cooling. However, there are many variables at play, so it is not a reliable method for freezing water quickly.
The Mpemba effect, where hot water freezes faster than cold water, is a complex phenomenon that is not fully understood. Some possible explanations include faster evaporation of hot water, differences in dissolved gases, and changes in the structure of water molecules.
yes
Yes it does. Cold water freeze slower than normal or hot water.
No. It takes longer to freeze because cold water is closer to it's freezing point.
The purpose of conducting the "Does hot water freeze faster than cold water" project is to investigate and understand the phenomenon known as the Mpemba effect, which suggests that hot water can freeze faster than cold water under certain conditions. This project aims to explore this concept and potentially uncover new insights into the freezing process of water.
The fact that hot water may freeze faster than cold is often called the Mpemba effect
Water will freeze faster than salt water.
no salt water does not freeze faster than sugar.
Yes. Water of any starting temperature must be cooled to 0 oC in order to freeze.
no because the cold water speeds up the process by starting it
Cold water, being the closest to freezing point, will obviously freeze the fastest. Hot water will freeze the second fastest, and salt water barely ever freezes, except in very cold conditions.
The time it takes for hot water to freeze depends on factors such as the initial temperature of the hot water and the surrounding temperature. In general, hot water will freeze faster than cold water due to the Mpemba effect, which is the phenomenon where hot water freezes faster than cold water under certain conditions.
Cold water will freeze faster. Because the freezing point of water is 0oC, water that is closer to that point will freeze faster then hot water. This is because it will require less time to lower the temperature to the freezing point.