Vacuum Pan Evaporator

Numéro d’image : 12626878
Vacuum Pan Evaporator
Brother Alonzo Hollister and his vacuum pan evaporator. This invention was used to distil herbs in a vacuum at very low temperatures, thereby preserving their medicinal qualities. It was this machine that inspired Gail Borden to invent evaporated milk. Vacuum evaporation is the process of causing the pressure in a liquid-filled container to be reduced below the vapour pressure of the liquid, causing the liquid to evaporate at a lower temperature than normal. Although the process can be applied to any type of liquid at any vapour pressure, it is generally used to describe the boiling of water by lowering the container's internal pressure below standard atmospheric pressure and causing the water to boil at room temperature. No photographer credited, undated.
Licence : Droits gérés
Crédit: Science Photo Library / NYPL / Science Source
Taille de l’image : 4500 px × 3172 px
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