• In my opinion, the answer is Yes! The bubble point of steam distillation obviously below that of the oil and steam , i.e P bubble= P total = P steam + P oil .But whether it works at 80 degrees Celsius depends on the system composition

See the question: "Is it possible for steam distillation to be carried out at temperatures higher than 100°C?"

https://www.researchgate.net/post/Is_it_possible_for_steam_distillation_to_be_carried_out_at_temperatures_higher_than_100C

Which question is correct"

Distillation cannot take place without the liquor boiling for the desired component to be distilled out. Boiling is a function f pressure. Water boils at (100oC) at 760mmHg atmospheric pressure. So decreasing the atmospheric pressure bellow 760mmHg, water will boil at lower than 100oC and the vapor condensed as distillate.

Yes under vacuum when the atmospheric pressure (760mmHg) is lowered below this.

In fact, if you are significantly above sea level you are already doing your steam distillation at less than 100 deg as the bp of water goes down as the altitude goes up.

Water boils at 100oC under 760mmHg. Reducing the atmospheric pressure lower than this will reduce the boiling temperature lower than 100oC. So with reduced atmospheric pressure, water will boil at lower (