﻿Lord 
  Kelvin 
  : 
  The 
  Problem 
  of 
  

   Fig. 
  3. 
  

  

  T 
  K 
  Vb 
  is 
  the 
  curve 
  of 
  temperature, 
  and 
  D 
  1>5 
  R 
  1-5 
  is 
  the 
  curve 
  of 
  density, 
  

   for 
  a 
  monatomic 
  gas 
  (*«lf). 
  T 
  R 
  2 
  . 
  5) 
  and 
  D 
  2 
  . 
  5 
  R 
  2 
  . 
  5 
  are 
  correspond- 
  

   ing 
  curves 
  for 
  a 
  diatomic 
  gas 
  (k 
  =1*4). 
  

  

  