Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
Hi Folks --
This is mostly a terminology question.
By way of background: the quantity
- ? P |
Ks = ------ | [1]
? ln V |S
is called the adiabatic bulk modulus, and its inverse is call
the adiabatic compressibility. It is common but sloppy to call
them "the" bulk modulus and "the" compressibility.
Reference: http://en.wikipedia.org/wiki/Bulk_modulus
So the question is, what do we call the quantity
- ? ln P |
? = -------- | [2]
? ln V |S
It is obviously dimensionless.
For ideal gases, it is equal to the adiabatic index i.e. the
ratio of specific heats i.e. ? .... We don't need a new
name for that; there are more than enough names already.
On the other hand, for water at 1 atm, the ratio of specific
heats is close to unity, whereas the dimensionless modulus
in eq. [2] is 22000 times greater than that.
If it helps, note that I am actually more interested in the
compressibility-like quantity
- ? ln V |
?? = -------- | [3]
? ln P |S
Is there a conventional name for either of [2] or [3], and/or
can anybody suggest a nice name?