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The Water Phase diagram is an easy way to represent the physical states of an object under various circumstances, like pressure and temperature. This is widely used in engineering, materials science, mineralogy, and physical chemistry. The phase diagram shows the conditions in which the different phases occur and coexists at equilibrium. Water is a special and exceptional element. A special property of water is that when water turns solid (ice), it has a less density than its liquid form.

Teach your students about the different states and phases of water with the Water Phase Diagram for PowerPoint. The Water Phase Diagram for PowerPoint offers a clear, visual aid that will allow you to easily explain what each phase is in a way that is digestible and simple to understand. This set of three PowerPoint slides is fully editable, providing you with the chance to change its colors, icons and text at will. On the right side, there is a graph that allows you to label the three states: solid, liquid and gas. It sits on an x and y axis that shows the different temperatures and other metrics that influence its transformation. On the left, you can input any helpful, additional information.

What is Phase Diagram Of Water?

The phase diagram of water is a complicated as it contains one or two critical points and several triple points. For water, the curve slopes to the left; this is because the liquid phase is denser than the solid phase. In the solid phase, the molecules of water crystalize that provides space in between the molecules. This makes ice less dense than water. It is the reason why you can melt ice under high pressure without using high temperature.

According to the phase diagram of water, the ice is the stable phase at low temperatures. While at higher pressure and normal temperature, water is the stable phase. At low pressure and high temperature, the vapor (gas) is the stable phase.

The Sublimation Curve

This curve separates the gas and solid. The line shows the relation of the vapor pressure of ice in relation to the temperature.

The Vaporization Curve

Another curve in the phase diagram of water is the vaporization curve. This line shows the equilibrium for the vapor pressure in terms of temperature.

The Fusion or Melting Curve

This curve is very special as it has a negative slope. This is because when ice melts, the molar volume of the reduces. Ice will melt at high pressure and low temperature.

What is Critical Point?

The critical point is the intersecting point of critical pressure and temperature.  In the gas phase, the water molecules are moving away quickly. This means at any higher temperature than the critical point (373.99 degrees Celsius) the gas phase cannot be dissolved irrespective of the pressure asserted.  The critical pressure is the magnitude of pressure that you must apply in the gas phase to turn it into the liquid form. As far as water is concerned, the critical pressure is high, nearly 217.75 atm.

Common Aspects of the Phase Diagram

The common aspects of the phase diagram include:

  • Phase boundaries or lines of equilibrium- The lines of equilibrium refer to the conditions under which the various phases can exist at equilibrium.
  • Triple points- These are points where the lines of equilibrium intersect each other. This indicates the point where all the 3 phases can coexist.
  • Solidus- It is the temperature under which the component is stable in the solid form.
  • Liquidus- The temperature above which the component can stay stable in the liquid form.
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