This is because the coolant is often under high pressure, and to keep it in the liquid state you must have sealed pipes.
You don't add coolant directly to the radiator, rather it goes into an overflow reservoir in the engine compartment. There will be a "min" or "max" line (or both) showing the proper level to be maintained. The reason we do not remove the radiator cap anymore is to keep the coolant system a sealed system so that no air can penetrate the coolant systems. By adding coolant through the reservoir (which has liquid in it already which is drawn from the bottom of that reservoir) we are not comprising the sealed system.
Sewage water. No, seriously. The cooling effect from evaporating water from the sewage of nearby communities is used to keep the circulating (extremely pure) coolant in the sealed cooling systems cool.
A few of the reasons: 1. So that the coolant does not leak out of the system. 2. So that the coolant can be made to circulate through the pipes (pressure is required). 3. So that Pressure can build up in the cooling system. This allows the coolant to reach a higher temperature before boiling. Once at its boiling point, the temperature will not rise, and additional cooling is inhibited.
During the Ship / Submarine Recycling Program (SSRP), reactors are removed, sealed at both ends, and eventually shipped to the Hanford Nuclear Reservation in Washington for burial in secure trenches.
You may have a blown head gasket. Have it pressure tested. The head gasket keeps the cylinder head sealed from the water that circulates through the heads to keep them cool. If the gasket gets a hole in it, then there is a gap in which oil can get into your coolant. Make sure what you are seeing is OIL in the coolant first.
In short no. Your cars cooling system is a sealed unit therefore it should not use any coolant whatsoever no matter the ambient temperature.
Canines have extra sensory receptors in their nose. Dogs have the ability to smell things through sealed vacuum bags and other sealed objects.
Don't! Most cars have a reservoir for radiator coolant ... add liquid to the reservoir. Opening the radiator cap introduces air into the sealed system ... you don't want air bubbles in the cooling system.
If you are talking about the material inside which the nuclear fuel is sealed, zircaloy is about the most common. This alloy, which is available in several "flavors" including Zirc-1, Zirc-2 and Zirc-4 are each almost all zirconium (over 95%). Nuclear fuel in the form of pellets or plates is welded inside zircaloy cladding to contain all the fission fragments that will appear as the fuel is burned. This material doesn't absorb thermal neutrons very well, so it won't "dilute" the chain reaction by taking some of these neutrons out of circulation. As one might expect, the heat generated within the fuel elements is transferred out through the zircaloy and into the primary coolant of the reactor. Wikipedia has some more information on zircaloy, and a link is provided.
sealed beam
"my sealed aquarium" is a poem written by Japanese poet, Yoshida Kenko. He reflects on the transient nature of life and the limitations of human existence through the metaphor of a sealed aquarium.
You don't need to wait. As soon as everything is sealed up you can pour in the coolant mix.