Flask Thermos Dewar
Product Code : LSK-CL-10059
Flask Thermos Dewar (SKU LSK-CL-10059) is a cylindrical vacuum flask of silvered glass held in a plastic container with a screw cap. The vacuum and silvering cut heat flow by conduction, convection and radiation, so a liquid inside stays hot or cold far longer than in a beaker. It can serve chemistry and physics labs for calorimetry and for holding ice or cold mixtures. Science Lab Supplies, a laboratory glassware supplier in India, dispatches it from Ambala to schools, colleges, institutes, contractors and distributors.
Specifications
Every feature of this vacuum flask is given its own row in the table that follows. To summarise, it is a cylindrical glass vessel with a vacuum and silvered surfaces, fitted inside a protective plastic container, and a screw cap closes the top to limit heat exchange with the room during an experiment.
| Specification | Value |
|---|---|
| SKU | LSK-CL-10059 |
| Also known as | Dewar flask, vacuum flask, thermos flask |
| Shape | Cylindrical |
| Insulation | Vacuum |
| Inner vessel | Silvered glass |
| Outer case | Plastic container |
| Closure | Screw cap |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the Dewar Flask
A Dewar flask works as a simple insulated calorimeter for measuring heats of reaction, neutralisation and solution, and as a store for ice-water baths or cold samples. It supports thermochemistry in NCERT Class 11 chemistry, heat-transfer lessons in school physics, and B.Sc. physical chemistry practicals.
- Class 11 chemistry: enthalpy of neutralisation of a strong acid with a strong base, with each volume measured in a Measuring Cylinder 100ml and the mixture stirred with a Glass Stirrer (Agitator).
- B.Sc. practicals: heat of solution and water equivalent of a calorimeter, with warm water prepared on a Magnetic Heating Stirrer.
- School physics: showing how a vacuum and silvering reduce the three modes of heat transfer.
- General lab use: keeping ice, cold buffers or freezing mixtures at a steady low temperature.
Handle the flask gently: the glass insert can break if knocked or if very hot and very cold liquids are poured into it in quick succession.
Standard Scope of Supply
Each Flask Thermos Dewar comes as the vacuum silvered glass vessel fitted in its plastic container and closed with the screw cap. A thermometer and stirrer for calorimetry work are separate items, and either can be listed on the same quotation when you request it.
Packing, MOQ and Lead Time
Quotations are available for one flask or for a full class set. Each quotation from Science Lab Supplies sets out the packing, delivery time and price for the number you need, and thermometers or other calorimetry items can be quoted on the same sheet.
Because Science Lab Supplies is a registered exporter holding an Importer-Exporter Code, it can ship to buyers in Uganda, the UAE, Saudi Arabia, Oman, the Philippines and Nepal. To have the flask priced, list it in the enquiry cart, raise a question through the contact page, or consult the lab tender page if your institution buys by tender.
Frequently Asked Questions
What is a Dewar flask used for in a chemistry lab?
It serves as an insulated vessel for calorimetry, such as finding the heat of neutralisation, and for keeping ice or cold liquids at a steady temperature during an experiment.
How does the flask keep liquids hot or cold?
The vacuum around the glass vessel blocks conduction and convection, and the silvered surfaces reflect radiant heat. The screw cap reduces losses through the opening.
Who supplies the Flask Thermos Dewar?
The flask is sourced and sent out by Science Lab Supplies from Ambala, India. Schools, colleges and contractors can have it quoted alone or grouped with thermometers and other calorimetry items in one order.
Which size of flask is offered?
Please tell us the volume you need through the contact page. The quotation then confirms the size of the flask offered, together with its packing and delivery time.
Related Calorimetry and Heat Apparatus
These chemistry and physics items pair with the Dewar flask in heat practicals: three ready-made calorimeters, two thermometer options for reading temperature changes, a flask heater for warming solutions, and two aids for insulation lessons. Any of them can share a quotation with the flask.
- Calorimeter — polished 100 ml vessel fitted with a rubber stopper and a metal stirrer.
- Copper Calorimeter Set — rests on a felt pad in a 100 x 75 mm outer vessel with a clip-type thermometer support and stirrer.
- Aluminum Calorimeter — aluminium vessel with an insulated handle for specific heat and latent heat work.
- Thermometer (with no Mercury) — slim glass stem and small bulb, scaled from −10 to 120 °C.
- Laboratory Thermometers — graduated glass alcohol thermometers covering −10 to 100 °C.
- Flask Electric Heater — glass yarn heating basket that wraps a 500 ml flask for uniform heating.
- Thermal Insulation Apparatus — thermostatic hot plate with 6 felt pads and an air cell double glazing panel.
- Heat Sensitive Paper — pack of 40 A4 thermochromic sheets in four colour pairs.
Browse the full Chemistry Lab range, the Heat range, or all school lab equipment.
Last updated: 9 October 2026
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