Analysts work with samples. The size of the sample needed depends on waht test need to be carried out.
Samples of aany item must be representitive. In other words, there should be enough of teh sample to give a picture ofthe whole item. The sampling method depends on the nature of the sample.
The composition of a homogeneous item is the same throughout, like a dairy milk chocolate bar.
The composition of a hetrogeneous item is not all the same, like a chocolate bar made in layers.
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