The maximum density of water occurs at a temperature of
Answer Details
The maximum density of water occurs at 4°C (39°F). This is because water is most dense at this temperature and any change in temperature either way will cause it to become less dense.
Imagine a glass of ice water and a glass of hot water. The ice water is less dense than the water it was made from because the ice takes up more space than the water it came from. On the other hand, hot water is less dense than the ice water because its molecules are moving around more, causing them to take up more space.
But at 4°C, water reaches its maximum density because the heat causes the water molecules to move around just enough to make it dense, but not so much that they take up more space.