Thus, for a one-component system with one phase, the number of degrees of freedom is two, and any temperature and pressure, within limits, can be attained. With one component and two phases—liquid and vapour, for example—only one degree of freedom exists, and there is one pressure for each temperature.
Q. What is the degree of freedom at critical point?
In the critical point the difference of density between the liquid phase and the vapour phase is so small the are indistinguishable, hence considered as single phase. So according the gibbs phase rule (. F=C – P +2) the degree of freedom should be 2.
Table of Contents
- Q. What is the degree of freedom at critical point?
- Q. What is the number of P C and F for a liquid at its critical point?
- Q. What is the degree of freedom of a system with a mixture of liquid and solid?
- Q. What is the degree of freedom when two phases coexist?
- Q. What is the degree of freedom when three phases coexist?
- Q. Which is the general form of phase rule?
- Q. What are the merits and demerits of phase rule?
- Q. What is reduced phase rule why it is so called?
- Q. Why is the eutectic point important?
Q. What is the number of P C and F for a liquid at its critical point?
However, the liquid–vapor boundary terminates in an endpoint at some critical temperature Tc and critical pressure pc. This is the critical point. In water, the critical point occurs at 647.096 K (373.946 °C; 705.103 °F) and 22.064 megapascals (3,200.1 psi; 217.75 atm).
Q. What is the degree of freedom of a system with a mixture of liquid and solid?
7. What is the degrees of freedom of a system with a mixture of water and ice? Explanation: F = 2 – 2 + 1 = 1.
Q. What is the degree of freedom when two phases coexist?
What is degree of freedom when two phases co – exist? F = 3 – 2 = 1.
Q. What is the degree of freedom when three phases coexist?
For a one-component system, there are no degrees of freedom (F=0) when there are three phases (A, B and C), and the three-phase mixture can only exist at a single temperature and pressure, which is known as a triple point.
Q. Which is the general form of phase rule?
The Gibbs phase rule p+n=c+1 gives the relationship between the number of phases p and components c in a given alloy under equilibrium conditions at constant pressure, where n is the number of thermodynamic degrees of freedom in the system.
Q. What are the merits and demerits of phase rule?
1) It is applicable to both physical and chemical equilibria . 2) It requires no information regarding molecular /micro-structure ,since it is applicable to macroscopic systems . 3) It is a convenient method of classifying equilibrium states in terms of phases ,components and degrees of freedom .
Q. What is reduced phase rule why it is so called?
Answer: Any such restriction inphase rule equation regarding constancy of one of the variables reduces the phase rule equation to following form – F = C – P + 1. OR. F + P = C + 1. This is known as reduced phase ruleequation.
Q. Why is the eutectic point important?
The system is used to make ice cream and to melt ice and snow. The eutectic point of the mixture of ethanol and water is nearly pure ethanol. The value means there is a maximum proof or purity of alcohol that can be obtained using distillation. Eutectic alloys are often used for soldering.
