"Hell is hotter than the Sun. It is a place of darkness and where the worm never dies. If using the physical limitation of the world, the fire is so hot that you cannot see the flame. There are some fire that does not have any visible flame such as fire with alcohol as a fuel. Regardless of the eternal address, you will have body either in Heaven or in Hell. The body in Hell will experience severe pain, something beyond what is known in the world. The pain will be in every cubic inch of your Hell body."
Hmmm, and you know all these details exactly how?
Therefore, no souls are leaving. As for souls entering hell, let's look at the different religions that exist in the world today. Some of these religions state that if you are not a member of their religion, then you will go to hell. Since there are more than one of these religions and people do not belong to more than one religion, we can project that all people and souls go to hell. With birth and death rates as they are, we can expect the number of souls in hell to increase exponentially.
Now, we look at the rate of change in volume in hell. Boyle's Law states that in order for the temperature and pressure in hell to stay the same, the ratio of the mass of souls and volume needs to stay constant. Two options exist:
1. If hell is expanding at a slower rate than the rate at which souls enter hell, then the temperature and pressure in hell will increase until all hell breaks loose.
2. If hell is expanding at a rate faster than the increase of souls in hell, then the temperature and pressure will drop until hell freezes over.
So which is it? If we accept the quote given to me by Theresa Manyan during Freshman year, "that it will be a cold night in hell before I sleep with you" and take into account the fact that I still have NOT succeeded in having sexual relations with her, then Option 2 cannot be true...Thus, hell is exothermic." "
From here: Hotter than hell