The volume of a partially filled Erlenmeyer flask can be estimated from simple measurements.
volume in mL =
= π / 3 * ((radius of base in cm)^2) * ((height of flask in cm) – ((((height of flask in cm) – (height of liquid in cm))^3) / ((height of flask in cm)^2)))
where:
• A cross-section of an Erlenmeyer flask is not a perfect triangle, with the edge at the base slightly curved. Ideally the top of the flask forms the apex, unless the neck is long.
• The filled portion of an Erlenmeyer flask is usually not a perfect right angle cone, but rather it is a truncated (frustum of a right angle cone). Fluid in the neck forms a cylinder.
• Measurements should take into account the thickness of the glass.
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