not only do we help people with their solutions we also want to make sure their solutions are not unnecessarily over engineered, ST is about keeping things as simple as possible to meet the real world needs. If you want to implement something that is not only unnecessary but also a waste of time then please go ahead.
Just out of curiosity I would like to hear your physics that answers the question that @Ryan780 has.
Also you have not given us a real world problem that you are trying to solve, so given that there is no absolute humidity sensors that work with ST we cannot possibly give you a solution, apart from use some algorithms in code to get exactly what you could possibly need.
Even if you have reptiles that need a very closely monitored humidity environment, I can’t comprehend why absolute would be necessary.
Unless you have an environment that you want to monitor the has such a large temperature fluctuation then I too cannot see why you would need it.
The important thing with home control is to remember that as others have said, your temperature variation is not enough to need to know absolute.
Perhaps you could educate us by telling us what your real world situation is.
Are you a physics lecturer, perhaps looking to setup an experiment for your students? or a scientist looking to setup an exponent of some sort? Thats about the only reasons I could possibly comprehend why you would need this.