

Experiments on the Latent Heat of Steam. 49 



Sp. ht. Water eqt. 



Weight of copper calorimeter... 284-5 °'°933 26*54 



„ brass stirrer 87 *o86 7*50 



„ glass worm and guides 46*8 -017 7*87 



Thermometer ... ... no 



Water in calorimeter (corrected 



for buoyancy in air) ... ... 1717-00 



Total ... = 1760*01 



Barometer-reading, 762-4111111. B.P. of water = ioo°-o7. 

 Weight of water condensed = 10-122 grammes. 

 We have then 



3-491 x 1760 



l = ojt Z / (joo-07 - l8'20) 



IO'I22 v ' ' 



= 525*13 cals. 

 We give in the following table the experimental details 

 of five experiments (including the one just quoted). 



1. Number of Ex- 



periment I. II. III. IV. V. 



2. Water- equivalent 



of calorimeter 



and contents ... 1760*0 1723-2 1749*2 1743*4 1681*0 



3. Temperature of 



steam 100*07 100-07 100*36 100-30 ioo*oo 



4. Initial temp, of 



calorimeter 14*588 13*027 12-968 12*528 14*948 



5. Final temp, of 



calorimeter (t r )..> 18*197 17*577 16*330 16*206 16*062 



6. Observed tem- 

 perature - differ- 

 ence 3*609 4-550 3*362 3-678 1-114 



7. Total correction. — 'ii8 — '134 — -127 — -239 — -123 



8. Duration of experi- 



ment in minutes. 12 15 8^ 13^ 5^ 



9. Weight of water 



condensed, in 



grammes 10*122 12*546 9*278 9*854 2*742 



10. Value of L 5 2 5* I 3 5 2 4'°7 5 2 5' 8 7 5 2 4'33 5 2 3' 6r 



Mean value of L deduced from experiments I. — V. = 524*60 



L— IV. = 524*85 



In the above calculations we have taken our heat unit as 



