What are the rules of weighing ?
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GENERAL RULES FOR WEIGHING. The mass of a liquid is always obtained by difference. Liquids that are noncorrosive and relatively nonvolatile can be transferred to previously weighed containers with snugly fitting covers (such as weighing bottles). The mass of the container is subtracted from the total mass
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Some general rules for the weighing:
Never handle objects with your fingers to weigh. ...
Weigh at room temperature, thus avoiding currents of air convection.
Never place chemicals directly on the pan, but weigh them in a vessel (weighing bottle, weighingdish) or on powder paper.
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