Ostwald Viscometer

Product Code : SCL-LG-11984

Ostwald Viscometer (SKU SCL-LG-11984) is a U-shaped glass capillary instrument for comparing the viscosity of liquids by timing how long a liquid takes to flow between two marked levels under gravity. It suits relative viscosity practicals in B.Sc. and B.Pharm courses, physics and chemistry teaching laboratories and research settings. Science Lab Supplies handles orders for it from Ambala in Haryana, India, and can deliver to colleges, research institutes, tender contractors and distributors.

Specifications

Each technical point of this capillary viscometer has its own row in the table below. In brief, it is a U-shaped tube of transparent laboratory glass with two timing marks, worked entirely by hand through filling, gentle suction and a stopwatch, so the falling meniscus stays visible throughout the run.

Applications and Experiments for the Ostwald Viscometer

The viscometer compares how readily two liquids flow. Flow times for a sample and a reference liquid such as water, taken at the same temperature, give the relative viscosity once both densities are known. It suits physical chemistry, properties-of-matter and pharmaceutics practicals at college level.

• B.Sc. physical chemistry: relative viscosity of a liquid with respect to water.
• B.Sc. practicals: how viscosity changes with solution concentration.
• Class 11 physics, mechanical properties of fluids: demonstrating viscosity.
• B.Pharm physical pharmaceutics: flow-time measurements on Newtonian liquids.

Hold the viscometer upright in a Three Prong Glassware Holding Clamp, draw the liquid above the upper mark with a Pipette Filler Bulb, and keep the reference liquid in a Borosilicate Beaker at the same temperature.

Standard Scope of Supply

Each order line covers one Ostwald Viscometer. A stand or clamp, suction accessory, thermometer, stopwatch and reference liquid are not part of the supply; any of them can be added as separate lines on the same quotation, which also confirms the capacity, capillary size and calibration status.

Packing, MOQ and Lead Time

Quotations can cover a single viscometer for a research bench or enough pieces for a whole practical batch. Every quotation lists the packing, delivery time and price for the quantity you name, and other chemistry lab equipment in India, such as pipettes or density bottles, can join the same enquiry.

Holding an Importer-Exporter Code as a registered exporter, Science Lab Supplies can ship to buyers in Sri Lanka, Vietnam, Malaysia, Peru, Egypt and Iraq. Science Lab Supplies is registered for GST (GSTIN 06ADEPJ0574F2ZU). To price viscometers for your bench, write through the contact page, place the item in the enquiry cart, or use the lab tender page for a formal tender.

Frequently Asked Questions

What is an Ostwald viscometer used for?
It compares the viscosity of liquids by timing a liquid's flow through a capillary between two marks under gravity. The sample's flow time is compared with that of a reference liquid to work out relative viscosity.

Does the viscometer come with a stand or thermometer?
No. The supply is the viscometer alone. A stand, suction device, thermometer, stopwatch and reference liquid have to be arranged separately or added as extra lines on the quotation.

Why must the temperature stay constant during a test?
Viscosity changes with temperature, so the sample and the reference liquid must be timed at the same steady temperature. Keep the viscometer vertical, repeat each run, and calculate with the equation that suits the experiment.

Who supplies the Ostwald Viscometer?
Orders are handled by Science Lab Supplies in Ambala, Haryana. It quotes the viscometer alone or with density bottles, pipettes and other glassware for colleges, research laboratories, contractors and distributors in India and abroad.

Related Viscosity, Density and Surface Tension Apparatus

Relative viscosity calculations need liquid densities, and viscosity, surface tension and density sit side by side in properties-of-matter teaching. These items cover those measurements, liquid transfer, temperature reading and support for the glassware, and any of them can be quoted with the viscometer.

• Stalagmometer — compares surface tension by counting drops from the volume between two reference marks.
• Specific Gravity Bottle — pycnometer that finds density by weighing a controlled volume of liquid.
• Viscosity Apparatus Stokes Method — one-metre borosilicate tube on a cast iron base, with six steel balls of different diameters.
• Nicholson Hydrometer — brass-sheet cylinder with loading pan and bucket for solid and liquid density.
• Volumetric Pipette 5ml — borosilicate, amber-stain markings, 5 to 50 mL capacities.
• Laboratory Thermometers — alcohol-filled glass thermometer, -10 to 100 °C.
• Laboratory Retort Stand — cast iron base with a 600 mm rod of 12 mm diameter.

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

Last updated: 9 October 2026