By using a high grade coffee pot when having a free teatime, its an enjoying moments.
A thermos, or vacuum flask is an insulated storage vessel that greatly retains the temperature of its contents, making it useful for keeping coffee hot.
The vacuum flask consists of two layer.
The gap between the two layer is partially evacuated of air, creating a near-vacuum which prevents heat transfer by conduction or convection.
Heat transfer by thermal radiation may be minimized by silvering flask surfaces facing the gap but can become problematic if the flask's contents or surroundings are very hot; hence vacuum flasks usually hold contents below the boiling point of water.
Most heat transfer occurs through the neck and opening of the flask, where there is no vacuum.
Vacuum flasks are usually made of metal, borosilicate glass, foam or plastic and have their opening stoppered with cork or polyethylene plastic.
Extremely large or long vacuum flasks sometimes cannot fully support the inner flask from the neck alone, so additional support is provided by spacers between the interior and exterior shell.
These spacers act as a thermal bridge and partially reduce the insulating properties of the flask around the area where the spacer contacts the interior surface.
Other improvements to the vacuum flask include the vapour-cooled radiation shield and the vapour-cooled neck,
both of which help to reduce evaporation from the flask.
1 x OSUKI 2.0L Stainless Steel Thermal Carafes Jar (Red)