What is Critical Point,Surge point,Yield point,Aniline point,Triple Point,Melting Point,Auto ignition Point?

#Critical Point:- 

A point on a phase the diagram at which both the liquid and gas phases of a substance have the same density, and are therefore indistinguishable.

# Surge point:- 


( For Rotating Equipments) , the peak point at the Performance Curve of the Centrifugal Compressors where the flow reversed back through compressors blades. 

# Yield point:- 

In mechanical engineering, the load at which a solid material that is being stretched begins to flow, or change shape permanently.

# Aniline point:- 

The lowest temperature at which aniline and a solvent (as gasoline) are completely miscible and which serves as an indication of the type of hydrocarbons present in the solvent, the content of aromatics being higher according to as the temperature is lower.

# Triple Point:- 

The temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. 

#Melting “ Liquification “ Point:- 

The temperature at which it changes the state of the material from solid to liquid at atmospheric pressure. 

#Autoignition “Kindling“ Point:-

The lowest temperature at which it spontaneously ignites in a normal atmosphere without an external source of ignition.