The moisture balance is an apparatus to measure the moisture content by applying the buoyancy. The moisture content of granular substances such as sand is directly indicated.
Let the sample be composed of the moistureless substance of mass m and the water of mass m
w, then the moisture content is expressed by
y=m
w/m×100.
Let the density of the moistureless sample be ρ and that of the water ρw. If the sample of mass M=m+m
w is weighed in water, the mass of the sample apparently decreases and the apparent mass M' of the sample is expressed
M'=M-(m/ρρ
w+m
w).
Hence M/M'=(1+y/100)ρ/ρ-ρ
wIf the values of ρ and ρ
w are already known, moisture ratio y is obtained by measuring the ratio M/M'.
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