I have a vacuum that shows a max vacuum gauge reading of 23"Hg when connected to a chamber. When placing room temperature water inside vacuum, the water doesn't boil. I have seen this chart before https://www.engineersedge.com/h2o_boil_pressure.htm which indicates that my vacuum pressure is not enough to boil the water at room temp. The chart states that I would need a vacuum pressure of about 29.12 "Hg to boil water at room temp. I understand this. However, I have seen multiple videos of people using water inside a syringe and being able to adjust the pressure (by adjusting the plunger) enough for the water to boil without the need of a powerful vacuum. How is this possible?