Study of perfect coffee

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A UNIVERSITY of Portsmouth researcher has claimed the size of the coffee grain is the most important factor in creating a perfect cup of coffee.

Dr William Lee said a better understanding of the physics and chemistry of coffee brewing could lead to better-designed coffee machines.

He said: ‘What makes the best coffee is hideously complicated – from the shape of the filter, to the scale of a single grain, to the flow rate of water and which machine or tool is used, there are an enormous number of variables.’