Do I need to add a heating device inside vacuum chamber in order to accomplish evaporation or just put the chemical mixture inside. I noticed water and milk will boil, nitrogen will freezes but when they asked me to evaporate in vacuum this mean adding fire or heat?

In a vacuum the temperature at which substances boil or become liquid decreases. Nitrogen will evaporate more rapidly than normal and this will have a cooling effect on the remaining nitrogen causing freezing.

Edited April 3, 20178 yr by fiveworlds

Evaporation in vacuum?

 

Do I need to add a heating device inside vacuum chamber in order to accomplish evaporation or just put the chemical mixture inside. I noticed water and milk will boil, nitrogen will freezes but when they asked me to evaporate in vacuum this mean adding fire or heat?

Maybe they asked for "distillation at lower pressure" aka "vacuum distillation".. ?

https://en.wikipedia.org/wiki/Vacuum_distillation

It's done with vacuum pump plugged to vacuum flask. And vacuum flask is typically heated from the bottom.

Edited April 3, 20178 yr by Sensei