I know there will be 3 translational D.O.F. and 3 rotational D.O.F., and it can have 4 vibrational D.O.F. (one potential and one kinetic) for each O-H Bond. But from where does 2 more D.O.F. come from? I am also not sure about the 4 vibrational D.O.F that I talked about. Is it really 4 or not? Well, it should be but when I searched on internet regarding this it showed that 6 Vibrational D.O.F. in water vapor are asymmetric, symmetric, wagging, twisting, scissoring and rocking. I don't know the meaning of each term so please also explain that.
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$\begingroup$ Related: physics.stackexchange.com/q/322057/2451 , physics.stackexchange.com/q/193249/2451 and links therein. $\endgroup$– Qmechanic ♦Commented May 17 at 10:44
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$\begingroup$ Are you treating the bond angle as fixed ? Or do you need to include DOFs where the bond angle flexes ? $\endgroup$– gandalf61Commented May 17 at 10:46
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3$\begingroup$ Does this answer your question? Why does $H_2$ have $C_V$=$7/2 R$ at high temperatures, while the total number of degrees of freedom is 6? $\endgroup$– John RennieCommented May 17 at 10:55
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$\begingroup$ @gandalf61 -I am considering all situations that can happen. $\endgroup$– UjjwalCommented May 18 at 3:36
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$\begingroup$ @ john Rennie - can you share some resources regarding this topic as I was not able to completely understand it $\endgroup$– UjjwalCommented May 18 at 3:38
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