Stalagmometer

Product Code : SCL-LG-11983

Stalagmometer (SKU SCL-LG-11983) is a glass capillary instrument for finding the relative surface tension of a liquid by counting the drops that form as a fixed volume runs out of it. The result is compared with a reference liquid such as water. It suits physical chemistry and pharmaceutics practicals at college and university level. Colleges, schools, tender contractors and distributors can obtain a quotation for it from Science Lab Supplies at Ambala, India.

Specifications

This drop-count stalagmometer is described row by row in the table. In short, a widened central bulb sits between an upper and a lower reference mark and ends in a narrow delivery tip where drops form; it is mounted vertically and worked by hand, while glass composition, capacity and calibration are confirmed on the quotation.

Applications and Experiments for the Stalagmometer

The liquid is drawn above the upper mark and allowed to drain freely while drops are counted between the two marks. Repeating with a reference liquid at the same temperature, and using both densities, gives the relative surface tension: γ1/γ2 = (n2 × ρ1)/(n1 × ρ2).

• B.Sc. physical chemistry practicals: surface tension of a liquid by the drop-number method, with the instrument held in a Retort Stand with Boss Head and Clamp.
• B.Pharm physical pharmaceutics: surface tension of liquids and the effect of surfactants.
• Studying how surface tension changes with the concentration of a detergent or alcohol solution.
• Class 11 physics enrichment: linking drop formation to surface tension and to capillary rise in 1 mm Capillary Tubes.

Never fill the stalagmometer by mouth; use a Pipette Filler Bulb or similar filler. Clean it thoroughly between liquids, since traces of grease or detergent change drop size.

Standard Scope of Supply

The supply is one glass stalagmometer, with its capacity confirmed on the quotation. A support stand, clamp, suction bulb, beaker, density-measurement equipment, counter and reference liquid can be added to the same quotation as separate items when your practical needs them.

Packing, MOQ and Lead Time

A single instrument can be quoted, or one for each practical group. Each quotation lists packing, delivery time and price for the quantity, and a viscometer, specific gravity bottle or stand can join it for a complete chemistry lab instruments supplier order.

Science Lab Supplies holds an Importer-Exporter Code as a registered exporter and can ship to buyers in Qatar, Sri Lanka, Vietnam, Malaysia, Peru and Egypt. Raise capacity or calibration questions on the contact page, pair the stalagmometer with a stand in the enquiry cart, or refer to the lab tender page for supply under tender.

Frequently Asked Questions

How does a stalagmometer measure surface tension?
It counts the drops formed while a fixed volume drains between two marks. Comparing that count and the liquid's density with those of a reference liquid gives the relative surface tension.

Why is the liquid's density needed?
Drop weight depends on density as well as surface tension, so the calculation uses the densities of both the sample and the reference liquid. A specific gravity bottle can be used to find them.

Who supplies the Stalagmometer?
The instrument is quoted by Science Lab Supplies from Ambala, India, which states capacity, packing and dispatch on each quotation for colleges, pharmacy institutes and tender buyers.

Does it need a stand?
Yes. It must be held vertically in a clamp on a retort stand while drops are counted, and the stand and clamp can be added to the same quotation as the instrument.

Related Surface Tension and Viscosity Apparatus

Surface tension practicals sit beside viscosity, density and capillarity work. These items from the Lab Glassware, Elasticity and Surface Tension and Physics Lab ranges measure the same properties by other methods or supply the density figures the drop-count calculation needs, and all can share one quotation.

• Ostwald Viscometer — U-shaped capillary timed between two marks for comparing viscosity.
• Specific Gravity Bottle — pycnometer for density or relative density by weighing.
• Searle's Surface Tension Balance — soap-film surface tension from a beam on a stretched wire.
• Jaeger's Surface Tension Apparatus — manometer and capillary tube on a wooden stand.
• Quincke's Surface Tension Apparatus — circular metal plate with levelling screws and spirit level.
• Capillary Tube Apparatus — six 150 mm capillary tubes of different bores in a trough.
• Rising Table with Capillary Tube Clamp — 4 inch cast aluminium table rising up to 12 inches.
• Viscosity Apparatus Stokes Method — one-metre borosilicate tube with a funnel cork at the top.

Browse the full Lab Glassware range, the Elasticity and Surface Tension range, or all school lab equipment.

Last updated: 9 October 2026