1. Fresh water freezes at O0C. This is called the freezing point of water.
2. Ice melts at O0C. This is called the melting point of water.
Yes, the freezing and melting point of water is the same temperature, which is O0C.
The answer is that the two boys would change places.
The answer is that the group would break up and each kid would be warmer. The kids would have more energy, but the the temperature would still be O0C.
Wait a minute! Where did all the warm clothes come from?
While not shown, there are other kids dressed in warm winter clothes and other groups of kids huddled together without winter clothing.
Think About This
1. At the surface of an ice cube, there is a thin layer of liquid water. This water layer as well as the layer of solid ice beneath it are both at the same temperature,
3. To be more energetic, the liquid water molecules must have more energy than the water molecules bound together in the ice crystals.
4. At the surface of the ice cube, there is a constant exchange of energy from the liquid water to the water in ice crystals. This means that ice crystals break up and change to liquid water. At the same time the liquid water molecules that have lost their energy form an ice crystal.
Liquid Water -energy —->Ice Crystals
1. There is always a thin water layer on the surface of ice as long as the ice is above -150C. Ice above -150C is referred to as wet ice. This means there is a thin layer of water on the surface of the ice.
2. While the thin layer of water and thin layer of ice below it are at O0C, the ice below the surface is generally colder if the air temperature has been below O0C..
Think About This
1. Energy from the water molecules is being transferred to ice crystals.
2. The presence of salt lowers the freezing point of water. The salty water does not freezes at O0C, thus the salty water gets colder as its energy is transferred to ice crystals.
3. There is no longer an equal change of liquid water to Ice crystals. When the ice crystals absorb energy from the salty water, the crystals melt forming liquid water. This fresh water mixes with the salty water and increases the amount of water on the surface of the ice. Layer after layer of ice absorbs energy from the salty water and melts. As the energy is taken away from the salty water its temperature decreases.