Editing Equation of state (section)

=== Morse oscillator equation of state ===
An equation of state of Morse oscillator has been derived,<ref>{{Cite journal |last=Al-Raeei |first=Marwan |date=2022-04-01 |title=Morse oscillator equation of state: An integral equation theory based with virial expansion and compressibility terms |journal=Heliyon |volume=8 |issue=4 |pages=e09328 |doi=10.1016/j.heliyon.2022.e09328 |doi-access=free |pmid=35520603 |issn=2405-8440|pmc=9062208 |bibcode=2022Heliy...809328A }}</ref> and it has the following form:

<math display="block">p = \Gamma_1 \nu + \Gamma_2 \nu^2</math>

Where <math>\Gamma_1</math> is the first order virial parameter and it depends on the temperature, <math>\Gamma_2</math> is the second order virial parameter of Morse oscillator and it depends on the  parameters of Morse oscillator in addition to the absolute temperature. <math>\nu</math> is the fractional volume of the system.