Slight hijack, but the question about opening a portal between Mexico City and Boston ignores gravitational potential (not to even mention the difference in velocity due to the Earth’s rotation). If the air from Boston had to not only move through the portal but also make up the altitude difference, the rate of flow would be zero- the same as air in equilibrium at any spot on Earth.
Portals are going to be ignoring a lot of physics no matter what. So you have to go with some basic assumptions about how portals work. Unless otherwise specified in this day and age portals work like they do in the game Portal. Those function basically as doors your velocity with respect to one side of the door are translated through to the other side. Which basically ignores things like the relative motion of the portals to each other and the potential energy due to position. This is consistent with most portals in fiction. Some teleportation stories will discuss the potential energy issues but almost all ignore velocity differences due to being on a rotating body.
Side note teleportation is not in the default chrome dictionary.
One critical issue frequently left out of these discussions on “extinguishing” the Solar furnace with water (or ice) is that, in addition to adding Hydrogen fuel to the fusion reaction, the Oxygen (rather than settling to the center as a relatively “inert” substance or being part of an Oxygen-Oxygen fusion reaction) takes an active role as a catalyst for the fusion reaction in the CNO Cycle.
In stars the mass of the Sun, the Proton-Proton reaction predominates, but a small percentage of the energy output is produced via the CNO Cycle. At about 1.3 Solar masses, the CNO Cycle is the dominant source of energy. If sufficient water (in whatever state) were added to have any potential for damping the Sun’s fusion reaction, it would push the total mass of the Sun high enough to make the CNO Cycle a much greater proportion of the energy produced.