I dont know if this realy goes here but I want to know what the coldest substance known to man is... I know that liquid helium is the coldest on earth but whats the hottest?

the inside of a TOKOMAK fusion reactor would be quite toasty!

It's rather misleading to talk of 'coldest' and 'hottest' substances. Any substance can be taken to any (physically real) temperature. Temperatures as low as a fraction of a degree above absolute zero have been attained, and, ass YT points out, the plasma in the centre of a hydrogen fusion reactor is like that at the centre of the sun.

The lowest temperature obtained in the lab is only a few nano-Kelvin, used to produce Bose-Einstein condensate.

the plasma in the centre of a hydrogen fusion reactor is like that at the centre of the sun.

 

Actually, it's much hotter than at the center of the sun - because you can't simulate the same amount of pressure, you have to up the heat.

It's rather misleading to talk of 'coldest' and 'hottest' substances. Any substance can be taken to any (physically real) temperature.

 

In principle, but not in practice.

Well, isn't a black hole suppose to be created if you get absolute zero or something?

 

I figure if you can get something hot enough, you could create matter.

 

But anything can be brought to a cold degree and hot degree.

 

In principle and practice it can happen, it just hasn't been discovered yet.

Well, isn't a black hole suppose to be created if you get absolute zero or something?

No. Black holes are dependent on mass, not temperature.

 

I figure if you can get something hot enough, you could create matter.

...and how is that?

Heh. I was going to say a scorned woman or an ex-girlfriend.

Heh. I was going to say a scorned woman or an ex-girlfriend.

Or the toilet seat on a winters morning!

cold and hot are relative your cant call something cold and hot without a point of referance in energy terms the highest for of energy released was at the FERMI labs during antimatter anhialation (i dont think i spelled that right check me here)

you cannot get matter cold enough to a point where it ceases to exist that would violate the law of conservation of energy. The matter thats sucked into a black hole is not destroyed mearly transported into another time or something like that. you cannot destroy matter or energy it violates entropy if thats the correct word

No entropy deals with the 2nd law of thermodynamics. Conservation of energy/matter is delt with in the first.