What is normal expanison of water? What is abnormal expanison of water?

Question

can u give me a link or meaning of it

Answer 1

Abnormal ? I don't understand what that would mean here. Whatever water does, it does -- it's always normal.

For pure water, it's density is a function of temperature and pressure. See the link.

Water is unusual (not abnormal), because its maximum density point is above its freezing temperature (for most pressures). That means that as it cools down below the max density point, it expands, and the solid (ice) form takes up more room than the liquid phase.

Answer 2

Water has the interesting characteristic of being the most dense a couple of degree above freezing. This means that from the densist point upward it expands like most other materials, increasing in volume with temperature.
But as it approaches freezing, it behaves in the opposite way, becoming less dense as the temperature drops and expanding abruptly with freezing. This means that the coldest unfrozen water is not at the bottom of a lake, but at the surface so ice forms easily and then protects the fish in the slightly warmer water below from being killed if the lake froze solid to the bottom. Most other liquids (parafin, lead) freeze from the bottom up.

Answer 3

Normal fluids are contracted when freezing. But water expands. That's why ice is floated on water. At 0 Celsius to about 4.0 Celsius water contracts. That is abnormal expansion. (when reduce temperature from 4.0 to 0 it expands.) After that when increasing water normally expands.