What is the difference between microstructure and phase?
a) What is the difference between a phase and a micro constituent? (a) A “phase” is a homogeneous portion of the system having uniform physical and chemical characteristics, whereas a “micro constituent” is an identifiable element of the microstructure (that may consist of more than one phase).
What general information can you get from a phase diagram for water?
Using the phase diagram for water, we can determine that the state of water at each temperature and pressure given are as follows: (a) solid; (b) liquid; (c) liquid; (d) gas; (e) solid; (f) gas.
Which are the different curves present in water system phase diagram?
The area AOC, AOB & BOC The curve or areas between the curves show the conditions at temperature & pressure under which a single phase i.e, ice, water & water vapor is capable of stable existence. Hence each system has two degree of freedom i.e. system is bivariant or divariant.
What is the name of the curve OB in water system?
equilibrium will disappear only water vapour will exist. The curve OB is called sublimation curve of ice, it represents the equilibrium between ice and vapour. At any point on the curve the following equilibrium will exist.
What is Triple Point curve?
In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. It is that temperature and pressure at which the sublimation curve, fusion curve and the vaporisation curve meet.
Why the slope of fusion curve is negative for water?
The melting curve or fusion curve of ice/water is very special. It has a negative slope due to the fact that when ice melt, the molar volume decreases. Ice actually melt at lower temperature at higher pressure.
Is the slope of fusion curve of water positive or negative?
What is the fusion curve?
The fusion curve (blue) represents when both solid and liquid are in equilibrium. The three lines meet at the triple point, a specific temperature and pressure where all three phases are in equilibrium. The vaporization curve ends at the critical point.
What do the curve lines represent in the phase diagrams?
The lines in a phase diagram represent boundaries between different phases; at any combination of temperature and pressure that lies on a line, two phases are in equilibrium.
Why do we need to know how do you interpret read phase diagrams?
Phase diagrams illustrate the effects selected variables of a system have on the state of matter. By examining the phase boundaries and the triple point, researchers can use phase diagrams to understand under which conditions a pure sample of matter exists in two or three state equilibrium.