Discussion
Consider the following statements about moisture content:
1. Wet basis values can never exceed one hundred per cent.
2. Dry basis values can exceed one hundred per cent.
3. Trade standards normally quote the dry basis.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 follow from the denominators. The wet basis divides by the whole sample, which necessarily contains the water, so the ratio cannot exceed one. The dry basis divides by the dry matter alone, so a sample with more water than solids gives a value above 100 per cent - a tomato at 95 per cent wet basis is 1900 per cent dry basis.
Statement 3 is wrong. Trade standards and grading quote the wet basis, because the delivered mass is what is weighed and paid for. The dry basis belongs to drying calculations, where the constant denominator is the convenience.
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