Quick Answer:The Stalagmometer is a Traube-type glass stalagmometer with a central bulb, a precision capillary and a polished flat dropping tip, used to measure surface tension by the drop-weight method; bulb volumes are 2, 5 and 10 ml.
Last updated: 18 October 2026
Key Features
Traube's type with a central bulb and precision-bore capillary.
Upper and lower permanent marks define the volume.
Ground, polished flat tip for uniform drops.
Bulb volumes of 2, 5 and 10 ml.
Fits standard burette clamps.
Technical Specifications
Specification
Value
Material
Borosilicate glass 3.3
Design
Traube's type, central bulb, capillary
Marks
Two permanent (upper and lower)
Tip
Ground and polished flat face
Bulb volumes
2, 5, 10 ml
Mounting
Burette clamp
How It Is Used
Liquid is drawn up past the upper mark and allowed to drip from the tip, and the drops formed as the level falls to the lower mark are counted. Comparing the count with that for a reference liquid gives the surface tension relative to it. The instrument must be free of grease, held vertical and run slowly enough for each drop to be counted.
Frequently Asked Questions
How does the Stalagmometer measure surface tension?
The drops formed by the fixed volume between the two marks are counted and compared with the count for a reference liquid, giving relative surface tension.
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