Stalagmometer

Product Code : SCL-LG-11983

The Stalagmometer is a capillary glass instrument used for measuring the relative surface tension of liquids by counting drops formed from a defined volume. It is intended for students, laboratory technicians, teachers and researchers who need a manual method for comparing an unknown liquid with a suitable reference liquid.

Product Description

A stalagmometer typically has a widened central bulb, upper and lower reference marks and a narrow delivery tip. The instrument is mounted vertically, filled above the upper mark and allowed to discharge slowly. The operator counts the drops released while the liquid meniscus moves between the two marks.

The sample result is calculated by comparison with a reference liquid of known surface tension, commonly using the drop counts and liquid densities. Cleanliness, constant temperature and consistent vertical alignment are essential for meaningful results. Explore related equipment under elasticity and surface-tension apparatus.

Key Features

• Drop-count measurement: Supports comparative surface-tension determination using drops formed from a defined liquid volume.
• Capillary delivery tip: Produces controlled drop formation during the measurement procedure.
• Reference markings: Define the measuring interval over which drops are counted.
• Glass construction: Provides visibility of the liquid meniscus and internal cleanliness.
• Manual operation: Requires no electricity, sensor or digital display.
• Comparative analysis: Allows a sample to be evaluated against a suitable reference liquid.
• Reusable instrument: Can be reused after thorough cleaning and compatibility assessment.

Technical Specifications

What’s Included in the Kit

• One glass stalagmometer of capacity to be confirmed

A support stand, clamp, suction bulb, beaker, density-measurement equipment, counter and reference liquid are not confirmed as included.

Applications and Uses

• Comparing the surface tension of two compatible liquids.
• Performing drop-count experiments in physical chemistry laboratories.
• Studying the effect of concentration on surfactant solutions.
• Investigating the relationship between drop formation and surface tension.
• Supporting laboratory exercises involving density and surface-tension calculations.
• Demonstrating manual stalagmometric analysis in colleges and universities.

Compatible vessels and liquid-handling products can be selected from the laboratory glassware range.

How to Use the Stalagmometer

1. Clean the instrument thoroughly and ensure that the capillary tip is unobstructed.
2. Rinse the internal surface with a small quantity of the test liquid.
3. Mount the stalagmometer vertically using a suitable stand and clamp.
4. Use a compatible suction device to draw liquid above the upper reference mark.
5. Allow the liquid to flow naturally without applying pressure.
6. Begin counting when the meniscus reaches the upper mark.
7. Stop counting when the meniscus reaches the lower mark.
8. Repeat the measurement until consistent drop counts are obtained.
9. Perform the same procedure with the reference liquid at the same temperature.
10. Calculate relative surface tension using the approved equation, drop counts and liquid densities.

Safety note: Never fill the instrument by mouth. Wear suitable PPE and use a suction bulb or approved filling device. Handle volatile, corrosive or hazardous liquids in accordance with their safety data and the laboratory’s approved procedure.

Care & Maintenance

• Clean immediately after use because residue can alter drop formation and invalidate results.
• Rinse thoroughly so that detergent or previous-sample residue does not remain on the internal surface.
• Do not insert wire or rigid tools into the narrow delivery tip.
• Store the clean, dry instrument in a protective case or secured glassware rack.

Why Choose Science Lab Supplies?

Science Lab Supplies manufactures and exports scientific instruments, laboratory glassware, experiment setups and educational equipment. Its product range supports schools, colleges, universities and institutional laboratories. Buyers can confirm capacity, calibration status, glass grade and required accessories before procurement. Additional practical instruments are available under chemistry laboratory equipment.

Frequently Asked Questions

What does a stalagmometer measure?

A stalagmometer measures the relative surface tension of a liquid through controlled drop formation, usually by comparison with a reference liquid.

How does the drop-count method work?

The operator counts the drops released while a fixed liquid volume passes between two reference marks. The sample count is compared with the reference-liquid count.

Why is liquid density needed?

Drop weight depends on liquid density as well as surface tension. The comparative calculation therefore commonly uses the densities of the sample and reference liquids.

Why must the stalagmometer be completely clean?

Oil, detergent or previous-sample residue can change wetting and drop formation, producing unreliable results.

Does a stalagmometer provide an automatic reading?

No. It is a manual instrument. Drop counting, density data and the appropriate calculation are required to determine the result.

Can it be used in educational laboratories?

Yes. It supports supervised physical-chemistry experiments involving surface tension, drop formation and comparative measurement.

Confirm the required capacity and accessories, then explore more laboratory research equipment from Science Lab Supplies.

Recommended image ALT text: Glass Stalagmometer with central bulb, reference marks and capillary tip for measuring liquid surface tension by drop count.