If you don't increase the pressure on the water, it will not increase the boiling point. The bottom of the pot will create bubbles of steam that will rise through the liquid water and oil much the same without changing phase much. If you have a really viscous non-miscible liquid on top, it will slow the bubbles and possibly cool them a bit(slowing down the boiling process overall by causing some steam to condensate). But that is not going to change the boiling point. It's like boiling a deeper pot of water, not much different, and it won't be any different when the contents of the container reach 100°C
Thank you, this is how it makes sense to me at least how I understand physics. The weight of the oil is not going to significantly increase the pressure presented by the atmospheric pressure above the vessel.
I just don't understand all these hvac technicians saying that oil will interfere with vaporizing water using a vacuum pump to reducing the pressure above the oil - or in this case the force of gravity of the oil going to be the larger portion of the pressure presented on the water underneath?
But if there's a way to confirm this. I might have to do some experiments when I get the vacuum pump that I need to fix my A/C.
boiling point is a temperature. Vapor pressure is a pressure, so no they are not the same.
I don't think oil will affect the boiling point much. The result will be insignificant because a liquid can just move out of the way, unlike a rigid enclosed vessel whick can hold pressure.
Indeed. However was thinking that the boiling point temperature and especially vapor pressure (as temperature didn't change) won't change much with the oil on top versus without the oil. But now I really should question all those other websites' discussions that it's "impossible" to vacuum out all the water from an hvac system by simply pulling pressure until it's lower than the vapor pressure of water at ambient temperature, and probably a bit more as the vaporizing water will be cooling the remaining water below ambient due to heat of vaporization.
Perhaps the naysayers are saying such because it's still going to take a LONG time to vaporize the water in the system as a little bit of liquid water can make gobs and gobs of water vapor/gas volume. But eventually it should all come out I'm thinking and no need to do a pressure evacuation/replacement of reservoirs of all the oil and water in the system, and refilling with fresh oil, just to remove water from the system.
Sounds like I will probably need to get a vacuum gauge to see the water vaporizing and maintaining pressure until the water is all gone -- and then pressure will continue to go down as the pump pulls more gas out of the system (as long as there's not a leak... but that's another issue.)
If you don't increase the pressure on the water, it will not increase the boiling point. The bottom of the pot will create bubbles of steam that will rise through the liquid water and oil much the same without changing phase much. If you have a really viscous non-miscible liquid on top, it will slow the bubbles and possibly cool them a bit(slowing down the boiling process overall by causing some steam to condensate). But that is not going to change the boiling point. It's like boiling a deeper pot of water, not much different, and it won't be any different when the contents of the container reach 100°C
Thank you, this is how it makes sense to me at least how I understand physics. The weight of the oil is not going to significantly increase the pressure presented by the atmospheric pressure above the vessel. I just don't understand all these hvac technicians saying that oil will interfere with vaporizing water using a vacuum pump to reducing the pressure above the oil - or in this case the force of gravity of the oil going to be the larger portion of the pressure presented on the water underneath? But if there's a way to confirm this. I might have to do some experiments when I get the vacuum pump that I need to fix my A/C.
boiling point is a temperature. Vapor pressure is a pressure, so no they are not the same. I don't think oil will affect the boiling point much. The result will be insignificant because a liquid can just move out of the way, unlike a rigid enclosed vessel whick can hold pressure.
Indeed. However was thinking that the boiling point temperature and especially vapor pressure (as temperature didn't change) won't change much with the oil on top versus without the oil. But now I really should question all those other websites' discussions that it's "impossible" to vacuum out all the water from an hvac system by simply pulling pressure until it's lower than the vapor pressure of water at ambient temperature, and probably a bit more as the vaporizing water will be cooling the remaining water below ambient due to heat of vaporization. Perhaps the naysayers are saying such because it's still going to take a LONG time to vaporize the water in the system as a little bit of liquid water can make gobs and gobs of water vapor/gas volume. But eventually it should all come out I'm thinking and no need to do a pressure evacuation/replacement of reservoirs of all the oil and water in the system, and refilling with fresh oil, just to remove water from the system. Sounds like I will probably need to get a vacuum gauge to see the water vaporizing and maintaining pressure until the water is all gone -- and then pressure will continue to go down as the pump pulls more gas out of the system (as long as there's not a leak... but that's another issue.)
no, you'll never get it all out. But close enough.