1104 
e Oc noe Sameer (( i) 
1 Ny a OPE Yay) te > 
(” is obtained from C, by dividing the total number of systems; 
n, denotes the value in the state of equilibrium. 
Applying the relation 
en ogee 
Ceo OW. 
we find for the pressure 
: ok En 
Pe t,t +O (lg Fo tog eg En 2 
where n, relates to the state of equilibrium of the volume V,n', to 
that of the volume V + dV. These numbers always differ ay,, and 
so, taking into account the condition of equilibrium, we find 
BIE ie 
eed Py . . e . e e 3 
I NV 1 (0) 
In order to calculate the average energy we can apply the relation 
oh 4 
a= 2 0 
00 
which gives, when the condition of equilibrium is taken into account 
eee 3 R 0 log yx, 
N ae (MSS Oe 
j F te 
Now, in many cases y, inasmuch as it depends on @, may be 
represented by @/q, (q independent of @) or in other cases by a 
complicate function of @. So, in the first case, 
Stee 
A Emo tr) 
Putting the energy that is supplied when the numbers 1, change 
R 3 
wath a 0 == = op, G bin) then we find that the condition of 
equilibrium (13) changes for this case into 
k k 
DR Vv, 
(13e) 
Pv, rm, 3s 
11 ne = Vel ze 11 eS =] x Sr 
1 
When we represent the energy of the molecules ¢, by « constant 
a, plus a function of the internal coordinates, then in the formula 
(132) the factor 
