In gravimetric measurement of liquids, which statement is correct?

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When weighing liquids, the actual amount you’re dealing with in terms of volume or concentration depends on how dense the liquid is and how it changes with temperature. Density links mass to volume, so knowing the product’s density lets you convert a measured weight into a volume or compare it to a specification. Temperature affects density and causes liquids to expand or contract, so the volume corresponding to a given mass can change with temperature. If you don’t account for density and thermal expansion, your gravimetric measurements can be biased or inaccurate. That’s why recognizing the need to consider product density and expansion is the correct approach. The other statements aren’t about the measurement principle itself—setting a unit to kilograms is a unit choice, and insisting only metric standards apply isn’t a necessary part of the gravimetric concept.