DENSITY OF WATER - Density is defined as the weight per its unit volume. Density of water depends on the temperature of the water. The usual value used in calculations is 1 gram per milliliter (1 g/ml) or 1 gram per cubic centimeter (1 g/cm3). The density of pure water actually is somewhat less than 1 g/cm3.

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Density Of Water

What Is the Density of Water?

^{by Anne Marie Helmenstine, Ph.D.}

The density of water is the weight of the water per its unit volume, which depends on the temperature of the water.

The usual value used in calculations is 1 gram per milliliter (1 g/ml) or 1 gram per cubic centimeter (1 g/cm³). 

While you can round the density to 1 gram per milliliter, here are more precise values for you.

The density of pure water actually is somewhat ​less than 1 g/cm³.

Here's a table listing the values for the density of liquid water.

Note that water can be supercooled where it remains liquid well below its normal freezing point.

The maximum density of water occurs around 4 degrees Celsius.

Ice is less dense than liquid water, so it floats.

Temp (°C)  Density (kg/m3)

+100  958.4

+22   997.7735

+20   998.2071

+80   971.8

+60   983.2

+40   992.2

+30   995.6502

+25   997.0479

+15   999.1026

+10   999.7026

+4    999.9720

   0    999.8395

−10   998.117

−20   993.547

−30   983.854

Anne Marie Helmenstine, Ph.D.

·   Ph.D. in biomedical sciences from the University of Tennessee at Knoxville - Oak Ridge National Laboratory.

·   Science educator with experience teaching chemistry, biology, astronomy, and physics at the high school, college, and graduate levels.

·   ThoughtCo and About Education chemistry expert since 2001.

·   Widely-published graphic artist, responsible for printable periodic tables and other illustrations used in science.

Experience

Anne Helmenstine, Ph.D. has covered chemistry for ThoughtCo and About Education since 2001, and other sciences since 2013. She taught chemistry, biology, astronomy, and physics at the high school, college, and graduate levels. She has worked as a research scientist and also abstracting and indexing diverse scientific literature for the Department of Energy.

In addition to her work as a science writer, Dr. Helmenstine currently serves as a scientific consultant, specializing in problems requiring an interdisciplinary approach. Previously, she worked as a research scientist and college professor. 

Education

Dr. Helmenstine holds a Ph.D. in biomedical sciences from the University of Tennessee at Knoxville and a B.A. in physics and mathematics with a minor in chemistry from Hastings College. In her doctoral work, Dr. Helmenstine developed ultra-sensitive chemical detection and medical diagnostic tests.

Anne Marie Helmenstine, Ph.D.

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https://www.thoughtco.com/what-is-the-density-of-water-609413