 So welcome back, so let us now see table number 1 which is the which is what we are looking at saturation line and the base is temperature. So table 1 saturation line base temperature, what you see here is a PT diagram again and as we know that saturation line starts from TP up to CP, triple point up to critical point. And the triple point is at 0.01 degree centigrade and 0.0006117 MPa mega Pascal. What do I mean by this base as a temperature that is what we want to understand, this is my liquid vapor saturation line and let us look at this point which lies on this LV saturation line. This may be a saturated liquid, saturated vapor, two phase whatever it could be but it lies on the liquid vapor saturation line and as I have already said that table 1 and table 2 they deal with liquid vapor saturation line only. So table 1 base is temperature it means that the temperature has been given to me of any system of any state I know the temperature and corresponding to this temperature I can find out of this thermodynamic state what is the pressure because this state lies on this line and because it has got a single degree of freedom if you remember the Gibbs phase rule we have to know only one parameter. The moment we know one property pressure or temperature we know the other property very well. So exactly here what has been given to me is temperature of this thermodynamic system and what I can get from here is corresponding PSAT or saturated pressure at given temperature. How do I get that here, I have been given that this system is at a particular temperature I just look at that point on this line I go vertically up I look at this point of intersection on this LV saturation line and corresponding to that whatever pressure I get is what we call it saturated pressure at this temperature. Table 1 gives these parameters, this is my table 1 I have just taken a snippet of this table 1 from the steam table and you can see that I have just shown 3 temperatures here so I am not going through all those 4 or 5 pages but I have just taken some temperatures for example here, obviously this table starts again from CP to CP so triple point which is at 0.01 degree centigrade and critical point which is at 373.9 degree centigrade and just look at this first 2 columns do not look at these properties which is what was shown over there but just concentrate on this first 2 columns and the first column what you see is temperature. What do I mean by this base temperature it means that the first column is temperature if the base is pressure the first column will be pressure so whatever has been given to me of this system if I know the temperature I will always refer to table number 1 and look at the temperature in this column and corresponding to this the second column which is PSAT value gives me the pressure which exists at this temperature alright so this is a saturation pressure at this temperature and therefore this is what we call as PSAT T it is given in MPA so this is the only difference between table 1 and table 2, table 1 has temperature as a base and corresponding to this temperature on the LV line what we get is PSAT T value. Let us now go to the steam table and just have a look at table number 1 to see how does it look this is table 1 saturation line base temperature we can see here saturated water and steam temperature based and you can see the first column here is temperature the first point is 0.01 degree centigrade which is the triple point it starts from 0.01 and corresponding to PSAT T is 0.006117 which I had shown in the snippet as the temperature starts increasing now from 0.01 degree centigrade from Tp up to Cp so we can see now there are incremental values of temperature this is a 1 degree centigrade increment right now and corresponding to that what you get is a corresponding PSAT value if I just show you value at 100 degree centigrade let us have a look at that we can see here at 100 degree centigrade the PSAT T is 0.10142 0.1 MPA I can go down the temperature increments are still 1 degree centigrade and you can see here the last value is Tc which is a critical temperature 373.946 and corresponding to that you have got a critical pressure which is PSAT T at this temperature which is 22.064 MPA and the increment is still 1 degree centigrade throughout that means table 1 has a temperature with an increment of 1 degree centigrade throughout running from Tp to Cp and what you get now here are all the values of different properties we will come back to this properties later little later let us just clear our concepts of table 1 and table 2. Let us now go back to the slides again let us now come to table 2 saturation line now base is pressure again you have got the same diagram VT diagram and you have got a LV saturation line running from Tp up to Cp alright and again locate one point on this line which is for which we have got a the thermodynamic system lies on this point because table 1 and table 2 deal with these lines only. So here now I say instead of temperature the pressure is a base so I will go in opposite direction to what I have done earlier I will locate the pressure now I have been given pressure as a given quantity. So I will locate the pressure go horizontally see the intersecting point with this system corresponding to that I will get now temperature alright so what you see here table 2 look at the corresponding pressure at a given pressure just find out this point and get now the T sat P value here the saturation temperature at given pressure earlier we were getting P sat at T and here what you get is T sat P so coordinate of this points coordinate of the system over here will be T sat and P sat in a system which lies on this line LV line it will have temperature and pressure coordinates as T sat and P sat or T sat P and P sat T that is what we can say about this. Let us now have a look at table 2 in short this is table 2 saturation line base pressure and the first point is triple point pressure and the second column what you see here is a T sat corresponding to this pressure so T sat P is what is given in the second column so the pressure values here will go from triple point pressure up to critical pressure the triple point pressure being 0.000611 MPA and corresponding to this P value the second column gives you T sat P alright similarly now I will go from triple point pressure up to critical point pressure in this table 2. So here you can see that this is my critical pressure 22.064 MPA and corresponding to that you have got T sat P for a temperature which is a critical temperature 373.946 alright. So the corresponding to any pressure and temperature the properties that you see here in this tables are going to be the same the only difference being what is given to you or what is your base pressure or temperature if pressure is given to you I will go to table number 2 if temperature is given to us I will go to table number 1 and that just decides which table I would see the property data that I get from both these tables are going to be the same let us now go to the slides again I am again going to show in short the same thing the snippet of this table 2 which I have just shown you again going from triple point pressure to critical point pressure here and just giving you value of let us say 0.1 MPA which is close to atmospheric pressure and corresponding to this 0.1 MPA you see 99.606 which is close to the boiling point and we know that this is the boiling point close to atmospheric pressure alright. Similarly as I just shown you at critical pressure what you have is the T sat P which is the critical temperature over here. So what have we learnt till now we just saw the steam table we went to the same table and saw table 1, table 2 and table 3 just the titles and what we have seen now is steam table table 1 we have understood the concept of temperature as a base and pressure as a base. Thank you very much.