how much water will you need to heat? At least 2.1 kg of water, since the absorption ratio for coffee is 2.1. Just 1 kg of water - you don't want to waste energy heating excess water About 1.4 kg of water, depending on the percent extraction we want About 1.2 kg of water, depending on how many grounds we use

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Calorimetry

Measuring the heat transferred during chemical reactions or other physical processes is known as calorimetry. It comes under the branch of thermochemistry.