Boiling point of anti freeze
I flushed and refilled my trucks radiator today. I noted on the bottle that a 50/50 solution of antifreeze/water will result in a 256 degree boiling point. This piqued my curiosity so I did a little...
Forum Discussion
marcsbigfoot20b27 wrote:Nope. It's 15 psi above atmospheric pressure. The cap regulates relative pressure, not absolute pressure. As atmospheric pressure goes down, so too does the pressure inside the radiator.
Cooling system is a closed system under pressure....lets use your 15 psi.
At sea level or 8000 ft it is still 15 psi in the cooling system. Should be the same boiling point high or low altitude.
Sea level atmospheric pressure is roughly 15 psi. With the cap, radiator pressure can go to ~30 psi (absolute). When you go to 10,000 feet, atmospheric pressure is ~10 psi, and radiator pressure is ~25 psi (absolute). In both cases, the radiator would have 15 psi (gage), which is the difference between atmospheric and radiator pressures.
The boiling point is relative to the absolute pressure.
