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How did the T-1000 die with molten steel in Terminator 2: Judgement Day?

The T-1000 is very powerful and has the ability to rejoin his body parts, but why was it unable to do so after being in molten steel?

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TL;DR

Due to immense heat and the huge amount of molten metal, he got confused and couldn't find the right parts to join together.

Long Version

T-1000 was designed as such that if any of his part is separated, a command of finding main and rejoin it together was implemented at molecular level.

From this page,

The concept of pain had never factored into the sensory sphere of the liquid machine. Pain was an indicator of damage to a part of the organism, but this organism didn't have parts, except on a purely molecular level and its molecules were each primitive, miniaturized versions of the total machine. If any section were parted, the separated parts would revert to liquid metal poly-alloy. The only default command implemented on the molecular level of this design was to find the main mass again and rejoin it as soon as possible. Each molecule had a range of fourteen kilometers..

As it is mentioned above, it was not one machine, but several nano machines working together. When he falls into molten steel, the heat melt its nano parts thus causing disruptions in its system.

From same page,

Keep in mind this is not one machine, its thousands of nano machines working together. The heat was melting the structure causing disruptions in the system, making T-1000 move in every possible way. The T-1000 didn't know what to do, that's why he kept bringing up all the data he had, showing all the copied characters. According to James Cameron in T2 Extreme DVD audio commentary, it was looking for solution.

In the novelization, it was stated that all its molecules were searching for the right channels back into its proper structure, but the extreme heat and great amount of the molten metal around it confused them. That's why he couldn't get his shape back and died.

From the same link,

Novelization: It was screaming. A terrifying, inhuman siren of scream, as all its molecules were searching for the right channels back into its proper structure, but the intense heat and volubility of the molten metal around it confused them.

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