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Water Density and Temperature

As water warms, it expands.* At 50° F a pound of water has a volume of 15.37 ounces. However, a 150° F pound of water has a volume of 15.86 ounces. Let's look at a water density versus temperature plot.

Water density vs. Temperature Plot - shows density drops as T increases.

The plot shows that water density decreases as temperature increases. Warm water weighs less than cool water. Does this match your experience? If you dive down into a lake, even on a very cloudy day, the water becomes cooler. The warm water is on top because it is lighter.

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* This is not true for water between 32° F and 39.2° F.


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