Defining the depth of measurement for moisture is
straightforward, since the moisture depth of measurement is a
function of the moisture content and decreases with an increase
in moisture. A set of normalized curves is shown in Figure 18,
which illustrates the effect of moisture content on the depth of
measurement.
Using the data taken to arrive at the curves shown in Figure 18.
Effect of Moisture on Depth, one can express the relationship
between the depth and the moisture content as:
Depth (in) = 11 - 0.17 M (pcf)
or
Depth (mm) = 280 - 0.27 M (kg/m
3
)
This equation covers 98% of the measured volume and is valid
over the moisture content range of 0-640 kg/m
3
(0-40 pcf).
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