Reply #41: And I am stating that you are denying the truth [View All]

If you want to use the term "good" as a comparative feel free but it does not detract from the initial falsehoods and the shoddy and misleading use of perfectly sound physical principles and parameters.

1) Air, water and concrete are poor conductors in absolute terms (see the original link);
2) In absolute terms steel is a fair conductor but no more than that;
3) The important issue is NOT conductance but heat transfer.

For effective heat transfer from the steel inner flask to the outside world you need movement of the working fluid, whether that is air or water. These flasks have been designed to be cooled by air (the working fluid) that is convecting, they have not been designed with water as the working fluid.

A) If water or silt is blocking the lower air vents then there will be little of no convection to transfer the heat from the inner flask, i.e. heat will build up and the temperature of the inner flasks will rise.

B) If water replaces air as the working fluid there will be little or no convective heat transfer because the flasks are not designed for that method of cooling, i.e. heat will build up and the temperature of the inner flasks will rise.

D) If semi-submerged conduction will not keep the flasks cool (transfer heat) because air is a very poor conductor, i.e. heat will build up and the temperature of the inner flasks will rise.

E) If fully submerged the rate of heat build-up will be marginally slower because water is a marginally better conductor of heat than air, i.e. heat will build up and the temperature of the inner flasks will rise.