Analysts work with samples. The size of the sample needed depends on what tests need to be carried out. Samples of any item must be representative. In other words, there should be enough of the sample to give a pictures of the whole item. The sampling method depends on the nature of the sample.
The composition of a homogeneous item is the same throughout, like dairy milk.The composition of a heterogeneousitem is not all the same, like a kitkat which is made in layers.
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