Sounds like a bad head gasket - actually almost certainly! One way to test..have someone with an emissions tester stick it in your radiator...if it registers emmissions gasses present..well the main way it would get there is through a bad head gasket. The gunk is probably coagulated exhaust. Also I'll bet your either getting light white smoke or water coming out the exhaust.
Isobaric heating is heating by adding only heat energy while maintaining the same pressure (isobar). Isothermal heating is heating by adding only pressure and no heat energy.
Yes
One flushes a radiator by draining the radiator, rincing the radiator, and then by adding a new coolant. One should remember that the drained coolant is toxic.
By stirring, heating, or adding more water :)
By adding iron fillings into sulphuric acid and then heating
By raising the temperature i.e. by heating it.
it will take about 20 minutes + adding coolant.
As long as you can keep adding coolant to it.
Have you spilt some on the radiator?
remove bottom radiator hose to drain system. flush system a few time before adding antifreeze.
Yes, because water can be removed by heating and vaporization.
The radiator on a 1999 Mercury Cougar is flushed by draining the radiator, filling it with water, and adding a commercially available radiator flush. The engine is allowed to circulate for 10 minutes, drained, flushed with fresh water, and refilled with coolant.