Why play on the ice surface?

The ice on the rivers and lakes or on the jars of water in the winter are all closed on the surface of the water, never happened in the case of ice in the bottom of the water. If you put an ice cube in the water, it will always float on the surface of the water. This proves that the ice is lighter than water.

(Photo: web.utk)

The ice is frozen from water, so why can the ice be lighter than water?

Water has a rather special characteristic.When the temperature is over 4 degrees Celsius, it still has the same characteristics as all other things; but when the water is below 4 degrees C, the characteristics of the water will be the opposite, ie cold hot and hot . The same amount of water, after its constituent ice volume will expand, according to Law II New: the mass is inversely proportional to the volume, and so the ice becomes lighter. So the ice is always agglomerated on the water surface without setting the bottom of the water. Only when the weather is really icy and the temperature drops to the lowest, can water on new rivers and lakes freeze from top to bottom.

(Photo: goingnorthrv)