from http://en.wikipedia.org/wiki/Relative_humidity
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A common misconception
Often the notion of air holding water vapor is presented to describe the
concept
of relative humidity. This, however, is a misconception. Air is a mixture of
gases (nitrogen, oxygen, argon, water vapor, and other gases) and as such the
constituents of the mixture simply act as a transporter of water vapor but are
not a holder of it.
Humidity is wholly understood in terms of the physical properties of water and
thus is unrelated to the concept of air holding water.[3][4] In fact, an
air-less volume can contain water vapor and therefore the humidity of this
volume can be readily determined.
The misconception that air holds water is likely the result of the use of the
word saturation, which is often misused in descriptions of relative humidity.
In
the present context the word saturation refers to the state of water vapor,[5]
not the solubility of one material in another.
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Reading this makes me think Galantini used the probe correctly.
Harry
