Illustration of a thermos or vacuum flask. The internal chamber, and the liquid that is contains (brown), is kept hot or cold by an insulating vacuum in the double wall of the inner receptacle. The vacuum prevents heat loss by conduction and convection. The internal walls of the flask may also be silvered to reflect and retain any radiant heat from the contents. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library |
Bildgröße: | 4181 px × 4181 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |