What is Cryonics?

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About Cryonics:

Cryonics, the practice of freezing an individual who has died, with the object of reviving the individual sometime in the future.
The word cryonics is derived from the Greek krýos, meaning “icy cold.”
It is an effort to save lives by using temperatures so cold that a person beyond help by today’s medicine can be preserved for decades or centuries until a future medical technology can restore that person to full health.
A person that is held in such a state is called a “cryopreserved patient”, because Cryonicists (the advocates of cryonics) do not regard the cryopreserved person as really dead.
Cryonic preservation can be performed only after an individual has been declared legally dead.
The process is initiated shortly after death, with the body being packed in ice and shipped to a cryonics facility.
There, the blood is drained from the body and replaced with antifreeze and organ-preserving compounds known as cryoprotective agents.
In this vitrified state, the body is placed in a chamber filled with liquid nitrogen, where it will theoretically stay preserved at -196 °C until scientists are able to find a way to resuscitate the body in the future.
Currently, there are a few hundred bodies that have been frozen through cryonics.

Q1: What is Liquid Nitrogen?

Liquid Nitrogen is an inert, colorless, odorless, noncorrosive, nonflammable, and extremely cold element. It is a cryogenic liquid (Cryogenic liquids are liquefied gases that have a normal boiling point below –130°F (–90°C). Liquid nitrogen has a boiling point of –320°F (–196°C).

Source: Australian Cryonics Firm Freezes First Client In Hopes Of Bringing Him Back To Life In Future