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Scientific Specific Gravity Bottle
Original price was: $1.80.$0.79Current price is: $0.79.
Quick answer: A specific gravity bottle, also called a pycnometer, is used to determine the density or specific gravity of a liquid or solid by comparing the weight of a precisely fixed volume of the sample to the weight of the same volume of water.
The bottle is fitted with a closely ground stopper that has a fine capillary hole running through it. When the stopper is inserted into a filled bottle, any excess liquid is forced out through the capillary, leaving behind a precisely fixed, repeatable internal volume every time. This precision is what makes the specific gravity bottle a reliable tool for density determination: by weighing the empty bottle, then the bottle filled with the test liquid, and separately with water, the specific gravity of the liquid can be calculated accurately.
A similar principle can be extended to find the density of a solid, by using the volume of liquid the solid displaces inside the bottle. Because the stopper is ground specifically to match its own bottle, the two should always be kept and used together as a matched pair.
Technical Specifications
| Parameter | Detail |
|---|---|
| Body material | Laboratory glass |
| Design | Ground glass stopper with fine capillary hole for a precisely fixed volume |
| Function | Determines density or specific gravity of liquids and solids |
| Capacity | Supplied in a range of standard laboratory capacities — confirm the exact volume required at enquiry |
Applications
- Determining the specific gravity or density of liquids
- Density determination of solids by liquid displacement
- Quality control checks on liquid samples in teaching and research labs
- Physical chemistry practicals on density and specific gravity
Care & Handling
- Always keep the bottle and its matched stopper together as a pair
- Handle the capillary hole in the stopper carefully to avoid blockage or damage
- Clean and dry thoroughly between different samples to avoid contamination
- Weigh on a clean, dry, calibrated balance for accurate results
Why Choose LabEquip
LabEquip supplies precision density-measurement glassware alongside our wider lab glassware range and chemistry lab equipment to schools, colleges and research laboratories across India. For bulk or institutional requirements, contact us and our team will help confirm the right capacity for your work.
Frequently Asked Questions
What is a specific gravity bottle used for?
It is used to determine the density or specific gravity of a liquid or solid by comparing the weight of a precisely fixed volume of the sample to the weight of the same volume of water.
How does the specific gravity bottle achieve a precise fixed volume?
The bottle is fitted with a closely matched stopper that has a fine capillary hole, so any excess liquid is expelled when the stopper is inserted, leaving a repeatable, precisely fixed internal volume every time.
How is specific gravity calculated using this bottle?
The bottle is weighed empty, then filled with the test liquid and reweighed, and separately filled with water and weighed; comparing the two filled weights against the empty weight gives the specific gravity of the liquid.
Can the bottle be used to find the density of a solid?
Yes, using a variation of the method where the volume of liquid displaced by a solid sample is used to calculate the solid’s density.
Why must the stopper and bottle be kept as a matched pair?
The stopper is ground to fit its specific bottle precisely, so mixing stoppers between bottles can change the fixed internal volume and affect the accuracy of results.
Does LabEquip supply specific gravity bottles for bulk or institutional orders?
Yes. LabEquip supplies scientific specific gravity bottles to schools, colleges and laboratories across India, including bulk and institutional orders. Contact us for a quotation.
Last Updated: September 2026
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