absolute zero

noun

: a theoretical temperature characterized by complete absence of heat and motion and equivalent to exactly −273.15°C or −459.67°F

Examples of absolute zero in a Sentence

Recent Examples on the Web

Superconducting quantum computers only work when chilled to a hair above absolute zero, requiring the whole machine to sit inside an ultra-cold refrigerator called a cryostat, where space is tight and cooling is expensive. — New Atlas, 23 Sep. 2026

The wave nature of an atom shows itself only when the atom is barely moving, which only happens when it is cooled down to nearly absolute zero. — Jacek Krywko, ArsTechnica, 11 Sep. 2026

Each of them features a superconducting film that’s cooled to a fraction of a degree above absolute zero. — Georgina Jedikovska, Interesting Engineering, 11 Sep. 2026

That proximity should allow Chang’e 7 to prospect for water ice trapped in smaller depressions near Shackleton that, because of the moon’s tilt, never see sunlight and have temperatures just a few dozen degrees above absolute zero. — Jonathan O'Callaghan, Scientific American, 20 Aug. 2026

Word History

First Known Use

1798, in the meaning defined above

Rhymes for absolute zero

• biro
• spiro
• subzero
• superhero

Kids Definition

absolute zero

noun

: a hypothetical temperature that has never been reached, represents no heat at all, and is equal to approximately −273.15°C or −459.67°F

Medical Definition

absolute zero

noun

: a theoretical temperature characterized by complete absence of heat and equivalent to exactly −273.15°C or −459.67°F