Thermal Properties of Normal Pentane. 359 



Relation of Pressure to Temperature at Constant Volume. 

 Isochors. 



For the smaller volumes isobars were first constructed 

 from the isothermals, and the temperatures at definite volumes 

 were read from the isobars. The data from which the 

 isobars were constructed are given below : — 



Isobars read from Isothermals. 



Temp.... 



< 

 ' 130°. 



140°. 



150°. 



160°. 



170°. 



180°. 



190°. 



200°. 



210°. 



220°. 



230°. 



Pressure 





in 



Volume in cub. cms. 



metres. 





12 



2-0066 



2-0796 



2-1692 

















16 



1-9958 



2-0639 



21464 



2-2546 

















20 



1-9852 



2-0500 



2-1266 



2-2240 



2-3526 



2-5600 













24 



1-9755 



2-0372 



2-1094 



2-1986 



2-3115 



2-4715 



27700 











28 



1-9661 



2 0254 



2-0935 



21767 



2-2780 



2-4105 



2-6145 



3-0840 









32 



1-9574 



20144 



2 0790 



2-1574 



2-2496 



2-3650 



2-5255 



2-7915 









36 



T9486 



20042 



2-0656 



2-1398 



2-2247 



2-3285 



2-4635 



2-6602 



2-9910 







40 



1-9406 



1-9948 



2-0532 



2-1256 



2-2026 



2-2965 



2-4160 



2-5775 



2-8100 



3-1960 





44 



1-9330 



1-9861 



2-0417 



2-1087 



2-1830 



2-2695 



2-3772 



2-5135 



2-7000 



2-9660 





48 



1-9257 



1-9776 



2-0307 



20946 



2-1652 



2-2460 



2-3438 



2-4630 



2' 61 80 



2-8290 



3-1180 



52 



1-9186 





2-0204 



, 2-0816 



2-1487 



2-2245 



2-3150 



2-4225 



2-5575 



2 7330 



; 2 9590 



56 







2-0106 



2-0691 



2-1335 



... 









2-6570 



| 2-8460 



111 the following tables the data for the isochors are given ; 

 those for small volumes were read from the isobars, and those 

 for larger volumes from the isotherms. 



Isochors read from Isobars. 



Volume. 



20. 



21. 



2-2, 



2-3. 



2-4. 



2-5. 



2-6. 



2-7. 



2-8. 



2-9. 



30. 



Pressure 





in 



Temperature. 



metres. 





12 



129-0 



142-5 



















16 



130-7 



144-7 



155-35 



163-45 



169-6 















20 



132-4 



146-8 



157-8 



166-3 



172-85 



177-75 













24 



134-15 



148-8 



160-1 



169-1 



1760 



181-3 



185-35 



188-4 



190-6 



192-1 



193-1 



28 



136-0 



150-8 



162-5 



171-85 



179-25 



185-05 



189-45 



192-55 



1950 



197-25 



198-9 



32 



137-7 



152-9 



1650 



174-65 



182-4 



188-65 



193-5 



197-4 



200-15 







36 



139-4 



154-9 



167-2 



177-5 



185-75 



19205 



197-4 



201-5 



204-95 



207-8 



210-2 



40 



1410 



156-8 



169-8 



1804 



188-85 



195-7 



201-25 



205-85 



209-7 



212-75 



215-6 



44 



142-9 



158-8 



172-05 



183-05 



191-8 



199 05 



205-1 



2100 



214-3 



217-9 



220-9 



48 



144-55 



160-95 



174-65 



185-9 



195-0 



202-6 



208-9 



214-25 



218-8 



222-75 



226-3 



52 



146-3 



162-95 



176-8 



188-3 



198-0 



206-0 



212-75 



218-3 



223-2 



227-7 



231-5 



56 



... 

 I 



164-95 













222-4 



227-75 



232-4 



... 



