Dewar Flask
Dewar Flask - Related Videos
08:39
Scale-Up of Mammalian Cell Culture using a New Multilayered Flask
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Cited by 4 •
2011
Cells play an instrumental and increasing role in research, and the discovery and development of new therapeutics. With this increasing need for greater number of cells we need more efficient and effective ways for growing and harvesting attachment dependent cells. A Multilayered flask with the right features can serve this purpose.
06:06
A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements
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2016
A simple liquid nitrogen Dewar/cryostat apparatus comprised of a small fused silica optical Dewar, a thermocouple, and a charge-coupled device (CCD) spectrograph are described. The experiments for which this Dewar/cryostat is designed require fast sample loading, freezing, and alignment, accurate and stable sample temperatures, and small size/portability.
08:18
Degassing Liquids with Freeze-Pump-Thaw Cycling
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2023
Source: Laboratory of Dr. Neil Branda — Simon Fraser University Degassing refers to the process by which dissolved gases are removed from a liquid. The presence of dissolved gases such as oxygen or carbon dioxide can impede chemical reactions that utilize sensitive reagents, interfere with spectroscopic measurements, or can induce unwanted bubble formation. A number of different techniques are available for degassing liquids; some of these include heating, ultrasonic agitation, chemical...
09:50
Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures
0 Views •
Cited by 4 •
2017
A protocol for determining the vitreous phase densities of micro- to pico-liter size drops of aqueous mixtures at cryogenic temperatures is described.
04:13
Bioscaffold Fabrication by Electrospraying: A Technique to Generate Microcarrier Scaffolds Derived from Extracellular Matrix of Decellularized Tissue
0 Views •
2023
This video demonstrates the procedure of extracellular matrix-derived microcarrier fabrication by electrospraying. These microcarriers simulate the native tissue-specific microenvironment and are stable in long-term 3D in vitro cell culture models.
FAQs
A vacuum between its walls creates a barrier that limits conduction and convection, two routes by which heat can move through or with surrounding material. By reducing these exchanges, the flask helps its contents retain their existing temperature for longer. This matters when chemistry work requires a stable hot or cryogenic condition.
Reflective surfaces limit radiant heat exchange, while the stopper restricts gas movement. These features address heat-transfer pathways that the vacuum does not directly control. Working together, they reduce unwanted thermal exchange with the surroundings, supporting temperature preservation during storage and helping maintain controlled conditions for chemistry experiments.
A stable thermal environment reduces unwanted changes in the sample or material being observed. Because the flask limits conduction, convection, radiant exchange, and gas movement through its design features, temperature-dependent measurements can be made under more consistent conditions. That consistency supports reliable interpretation when temperature influences an experimental observation or result.
The flask provides an insulated storage environment for liquid nitrogen, dry ice, and other cryogenic materials. By reducing heat transfer, it helps preserve the low-temperature condition associated with these substances. Chemistry laboratories can therefore use it for cryogenic storage and cooling-related work when maintaining a cold material is important to the experiment or sample.
They are useful when a sample must be kept from unwanted temperature changes during storage or handling. The insulating walls, reflective surfaces, and restricted gas movement reduce multiple routes of heat exchange, helping preserve the sample’s temperature. This is relevant to chemistry experiments in which temperature stability affects the reliability of observations or measurements.
For hot substances, the flask can reduce heat exchange with the surroundings and help retain the material’s temperature. This allows chemists to store heated contents or use the container while controlling thermal change during an experiment. The result is a more stable temperature condition, which is useful when heat loss could interfere with temperature-dependent measurements or other observations.