1. A dewar vessel (or dewar flask) is designed for a good thermal insulation.

2. A conventional thermos isn't good enough, but a Dewar flask, invented in the 19th century, holds cryogenic fluids like liquid nitrogen at temperatures of -196oC (-321oF) for months at a time.

3. A Dewar flask with an internal vial dispenser is never going to be as cheap as a Styrofoam ice chest.

4. Dewar flask with an internal vial dispenser is never going to be as cheap as a Styrofoam ice chest.

5. A suitable device was used instead of the original Dewar flask in the phosphorescence attachment of the spectrophotometer.

6. An analysis of the mechanism of heat transfer in Dewar flask is made and shows that heat radiation in given case is not negligible.