Meniscus reading and its influence on volumetry
The reading of a meniscus is a critical step in measuring the volume of any volumetric instrument, being even the biggest source of error associated with volumetric articles is bigger as the cross section of the article to be measured, increases.
Knowing that the meniscus is the curve that forms on the surface of a liquid close to the surface of the container in which it is contained, and can be concave or convex depending on the type of liquid and the surface on which it forms.
In the case of volumes determined by LINEX, the liquid used is water at 20 ° C, so the meniscus is concave.
ISO standards require that the volume be read at the lowest point of the liquid level. This lowest point coincides with the upper limit of the graduation
To obtain an accurate result, the observer’s eye must be at the same height as the meniscos