Give a use of thermal expansion of water.
the most striking effect of this phenomenon is the freezing of water in a pond. When water near the surface cools down to 4oC it is denser than the remaining water and thus will sink to the bottom. This "turnover" results in a layer of warmer water near the surface, which is then cooled. Eventually the pond has a uniform temperature of 4oC. If the temperature in the surface layer drops below 4oC, the water is less dense than the water below, and thus stays near the top.
As a result, the pond surface can completely freeze over, while the bottom may remain at 4oC . The ice on top of liquid water provides an insulating layer from winter's harsh exterior air temperatures. Fish and other aquatic life can survive in 4oC water beneath ice, due to this unusual characteristic of water. It also produces circulation of water in the pond that is necessary for a healthy ecosystem of the body of water.
the most striking effect of this phenomenon is the freezing of water in a pond. When water near the surface cools down to 4oC it is denser than the remaining water and thus will sink to the bottom. This "turnover" results in a layer of warmer water near the surface, which is then cooled. Eventually the pond has a uniform temperature of 4oC. If the temperature in the surface layer drops below 4oC, the water is less dense than the water below, and thus stays near the top.
As a result, the pond surface can completely freeze over, while the bottom may remain at 4oC . The ice on top of liquid water provides an insulating layer from winter's harsh exterior air temperatures. Fish and other aquatic life can survive in 4oC water beneath ice, due to this unusual characteristic of water. It also produces circulation of water in the pond that is necessary for a healthy ecosystem of the body of water.
