I've also got another bone to pick with Jeff...
 
Let's please not claim that there is NO air (i.e., O2 and N2) in the steam... 
-------> ever hear of a "dissolved oxygen meter"? 
-------> ever been in the hospital when they put an oximeter probe on your 
finger?
-------> ever hear of the term, 'blood gases'?
-------> if there was no oxygen in liquid water, then all aquatic life would 
suffocate!
 
It should be very obvious that water HAS dissolved gases in it, and when the 
water is vaporized the
dissolved gases are also released and present in the steam, although not at the 
same concentration
as the ambient (normal) 'air'.
 
But all that is moot since it is NOT necessary to have ANY 'air' in order to 
make a humidity
measurement... 
 
"... an air-less volume can contain water vapor and therefore the humidity of 
this volume can be
readily determined."
 
-Mark

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