pint of lager
brewing on the verandah
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The meniscus is the slope in the fluid due to surface tension of the fluid being measured as it contacts the edges. The standard way is to measure the bottom of the meniscus, that is the level lower bit, not the high part where it actually contacts the hydrometer scale. Different chemicals alter the surface tension, but not where the bottom of the mensicus occurs.
So measure from the bottom of the meniscus, not the top. Except for fluids that bulge the other way, like mercury.
So measure from the bottom of the meniscus, not the top. Except for fluids that bulge the other way, like mercury.