At What Temperature Is Water At Its Densest

However at zero degree c water freezes and forms ice.

Because ice is less dense than water it floats. Density is measured as mass g per unit of volume cm. Water molecules like all molecules vibrate. At this temperature water s density is about 999 9720 kilograms per cubic meter.

The temperature at which water is most dense is 3 98 degrees celsius 39 164 degrees fahrenheit 277 13 kelvin. At 39 f or 3 98 c to be exact water is the most dense. The closer the molecules the heavier. If water was most dense at its freezing point 0 c then it would sink to the bottom freezing a body of water from the bottom up killing all of the organisms living within it 29.

Therefore a lake will freeze first at its surface. This is because the molecules are closest together at this temperature. So when is water at its densest. As you can see in the chart water only has an exact density of 1 g cm 3 at 39 2 f or 4 0 c.

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Ice is a crystal and there is more space between the molecules within an ice crystal than there is space between water molecules in liquid form at 4 degrees c. Water density changes with temperature and salinity. Water density at different temperatures below is a chart that shows the density of water in grams cm 3 at different temperatures ranging from below water s freezing point 22 f 30 c to its boiling point 212 f 100 c. At 4c they are as close as they can get making the water denser.

The higher the temperature the faster the vibrations within limits as water cools down the molecules vibrate more slowly and so move closer together. Water is densest at 3 98 c and is least dense at 0 c freezing point. Well it turns out this happens to be around 4 c. The maximum density point is particularly important in freshwater.

At room temperature 20 degrees celsius water has a density of 998 2071 kilograms per cubic meter.