00:01hey friends welcome to 2 minute process engineering can today's our topic is critical
00:06pressure so critical pressure we try to understand by property diagram when any liquid heated at
00:15constant pressure or isobaric process it's it start heating after the saturation temperature
00:22the first bubble forms it's called the its bubble point or a boiling point and if you further heat
00:29it the temperature will be remains constant but the complete vapor will form at this condition
00:35both isobaric and isothermal process goes together because temperature is constant and pressure is
00:41also constant if you further heat it the vapor will be superheated vapor you will find and once
00:47if you reverse this process and try and start cooling the vapor then you will come where the
00:53first drop of liquid forms which is called the dew point so in this property diagram p is your
01:01boiling point or bubble point and p dash is your dew point if you plot such uh boiling point and
01:09a
01:09dew point for higher pressures like p pq and r point then you will find that
01:18specific volume between the bubble point and dew point becomes smaller and smaller
01:23which is this you will find that this is curve is coming closer and the point comes
01:30where the bubble point and dew points becomes merged together so this point is called as a critical
01:36point and this the pressure at this point is called the critical pressure
01:44basically this point
01:47uh identifies the critical pressure and critical temperature both these also critical specific
01:53volume but these terms is not generally used so this way we can understand the what is the critical
01:59pressure pressure based on the pressure pressure based on the property diagram
02:01so
02:02so
02:02you
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