Excerpt from Determination of the Specific Gravity of Milk, The Percentage of Acid and Casein in Milk, The Adulteration of Milk by Skimming and Watering, The Percentage of Water and Salt in Butter, The Percentage of Fat and Water in CheeseSince liquids expand and become lighter when warmed, and contract and become heavier when cooled, an hydrometer will only give a correct reading when used in a liquid at the temperature for which it is constr...
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