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Phase Diagram for Water. Water is a unique substance in many ways. One of these special properties is the fact that solid water (ice) is less dense than liquid water just above the freezing point. The phase diagram for water is shown in the figure below.
PHASE DIAGRAMS #3. (Single Component) Part A – Generic Phase Diagram. Answer the questions below in relation to the following generic phase diagram. 1. Which section represents the solid phase? ________ 2. What section represents the liquid phase? ________ 3. What section represents the gas phase? ________ 4.
We can use the phase diagram to identify the state where water exists under specific temperature and pressure conditions. For example, water is ice at 50 kPa and – 10 o C. Water is unique compared to other substances.
A phase diagram is a graphical representation of the various phases of a substance or mixture of substances that coexist in thermodynamic equilibrium, and undergo phase changes under different working conditions, such as temperature, pressure, or volume. The water system is divided into three phases: ICE (S), WATER (L), and WATER VAPOUR (G)
phase diagrams is a type of graph used to show the equilibrium conditions between the thermodynamically-distinct phases; or to show what phases are present in the material system at various T, p, and compositions. “equilibrium” is important: phase diagrams are determined by using slow cooling conditions ⇒ no information about kinetics.
The phase diagram of water illustrates the relationship between temperature, pressure, and the physical states of water: solid, liquid, and gas. At low temperatures and high pressures, water exists as a solid (ice), while at higher temperatures and lower pressures, it exists as a gas (water vapor).
This lecture defines and gives examples of phase, one phase and two phase systems, equilibrium, component, and triple point. A detailed discussion of the most familiar one phase system, water, is followed by comparisons of the phase diagrams of aluminum and silicon.
