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, usually water. It is a standard piece in physical chemistry and pharmaceutics practicals at college and university level. Science Lab Supplies provides it from Ambala, India to colleges, schools, training institutes, tender contractors and distributors.

Specifications

The instrument has a widened central bulb between an upper and a lower reference mark, and ends in a narrow delivery tip where drops form. It is mounted vertically and operated by hand, with no power or display. Glass composition, capacity and any calibration are not stated in the listing and 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.
• 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.

Never fill the stalagmometer by mouth; use a suction bulb or pipette filler. Clean it thoroughly between liquids, since traces of grease or detergent change drop size.

Standard Scope of Supply

The listing covers one glass stalagmometer, with its capacity confirmed on the quotation. A support stand, clamp, suction bulb, beaker, density-measurement equipment, counter and reference liquid are not confirmed as included and can be quoted as separate items.

Packing, MOQ and Lead Time

Physical chemistry labs often order one per practical group, though a single instrument can be quoted too. 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. Ask for details or a price on the contact page, collect several items in the enquiry cart, or consult the lab tender page for tendered supply.

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 is commonly used to find them.

Who supplies the Stalagmometer?
Science Lab Supplies supplies the instrument from Ambala, India and confirms its capacity, packing and dispatch on each quotation for colleges, pharmacy institutes and tender buyers.

Is a stand included?
No stand or clamp is listed with the instrument. It must be held vertically in a clamp on a retort stand, which can be added to the same quotation.

Related Physical Chemistry Apparatus

Surface tension practicals usually run alongside viscosity and density measurements. These four items cover density, viscosity, safe filling and mounting, so the stalagmometer bench can be quoted as one set.

• Ostwald Viscometer — viscosity by the flow-time method.
• Specific Gravity Bottle — densities for the surface tension calculation.
• Pipette Filler Bulb — safe suction instead of mouth filling.
• Laboratory Retort Stand — holds the instrument vertical.

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Last updated: 25 September 2026