884 



Dr. R. D. Kleeman on the Effect of th 



somewhat less than \ u and approximately independent o£ 

 the temperature over a considerable range. The effect of the 

 transition layer on the surface-tension is thus quite large. 



Ethyl oxide, C 4 H 10 O. 



Carbon tetrachloride, CC1 4 . 



T. 



iv 



P- 



X 2 . 



\. 



K~^i- 



T. 



L r 



P- 



X, 



K 



x 2 -xj 



313 



75-36 



•6894 



2312 



14-05 



9-07 



363 



40-62 



1-4554 



2648 



17-60 



8-58 



323 



73-01 



•6764 



22-12 



12-94 



9-18 



373 



39-68 



1-4343 



25-33 



16-48 



8-85 



333 



70-79 



•6658 



21-20 



11-80 



9-40 



383 



38-64 



1-4124 



24-41 



15-41 



900 



343 



68-35 



•6532 



20-27 



10-72 



9-55 



393 



3763 



1-3902 



23-52 



14-32 



9-20 



353 



65-85 



•6402 



19-27 



9-67 



9-60 



403 



36-58 



1-3680 



22-62 



13-27 



9-35 



363 



63-31 



•6250 



18-19 



8-63 



9-56 i 



413 



35-56 



1-3450 



21-94 



12-22 



9-72 



373 



60-33 



•6105 



17-16 



763 



9-53 ' 



423 



34-42 



1-3215 



20-81 



11-21 



9-60 



Methyl formate, C 2 H 4 2 . 



Benzene, C 6 H 6 . 



303 



107*5 



•9598 



38-35 



23-09 



15-26 



353 



85-62 



•8415 



29-87 



20-28 



9-59' 



313 



103-9 



•9447 



36-64 



21-56 



15-08 



363 



83-74 



•8041 



28-97 



19-16 



9-81 



323 



99-51 



•9294 



34-74 



20-05 



14-69 



373 



81-98 



•7927 



28-06 



18-02 



10-04 



333 



95-59 



•9133 



32-98 



18-58 



14-40 



383 



80-05 



•7809 



27-15 



16-86 



10-29 



343 



92-16 



•8968 



31-94 



17-55 



13-89 



393 



78-12 



•7692 



26-24 



15-71 



10-53 



353 



88-03 



•8803 



29-65 



15-70 



13-95 



403 



76-10 



•7568 



25-28 



14-57 



10-71 



363 



i 



85-10 



•8636 



28-25 



14-29 



13-96 



413 



74-09 



•7440 



24-33 



13-45 



10-88 



In previous papers a formula for the surface-tension \ of 

 a liquid was obtained on the supposition that no transition 

 layer is formed and that the molecular attraction is given by 

 the expression 



where m/ denotes the atomic weight of an atom of a 

 molecule. This gave 



where m 1 denotes the molecular weight relative to hydrogen, 

 and k is a quantity which has the same value for all sub- 

 stances at corresponding states. This equation was found to 

 agree well with the facts. It follows, therefore, that each 

 of the quantities \ 1? X 3 , and (X 2 — \{) obeys the relation 

 expressed by this equation. 



The influence of the surrounding vapour of a liquid on its 

 surface-teDsion may approximately be taken into account by 

 supposing that we are dealing with a liquid of density 

 (pi~~p2) which is not surrounded by vapour, where pi 



