Fugacity: It is derived from Latin, expressed as fleetness or escaping ...
Fugacity: It is derived from Latin, expressed as fleetness or escaping ...
Fugacity: It is derived from Latin, expressed as fleetness or escaping ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
dP<br />
dT<br />
T<br />
<br />
Q<br />
V V <br />
g<br />
l<br />
Vg>>>Vl (G<strong>as</strong> volume <strong>is</strong> very high when compared to liquid volume)<br />
dP H<br />
<br />
dT TV<br />
V<br />
g<br />
H V (Latent heat of vap<strong>or</strong>ization),<br />
dP P<br />
<br />
dT TRT<br />
dP dT<br />
2<br />
P R T<br />
V g <br />
RT<br />
P<br />
Integrating the above equation <strong>from</strong> T1to T2 and pressure <strong>from</strong> P1 to P2.<br />
P<br />
2<br />
dP <br />
<br />
P R<br />
P<br />
1<br />
P<br />
ln<br />
P<br />
2<br />
1<br />
1<br />
<br />
R T1<br />
<br />
1<br />
T<br />
2<br />
<br />
<br />
<br />
Th<strong>is</strong> equation <strong>is</strong> used to calculate the vap<strong>or</strong> pressure at any desired temperature.<br />
Problem:<br />
The vap<strong>or</strong> pressure of water at 100 o C <strong>is</strong> 760mmHg. What will be the vap<strong>or</strong> pressure<br />
at 95 o C. The latent heat of vap<strong>or</strong>ization of water at th<strong>is</strong> temperature range <strong>is</strong><br />
41.27KJ/mole.<br />
P 760mmHg<br />
P<br />
1<br />
2<br />
T<br />
<br />
T<br />
2<br />
1<br />
<br />
dT<br />
T<br />
T<br />
T<br />
1<br />
2<br />
100 273 <br />
95 273 <br />
373K<br />
368K
Change language