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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
First, take a 15-kilogram bar of beryllium (or some similar material) and cool it almost all the way to absolute zero, the minimum possible temperature.
—Charlie Wood, Quanta Magazine, 30 Oct. 2024
They're also designed to operate at cryogenic temperatures close to absolute zero (around minus 459 degrees Fahrenheit).
—Kate Irwin, PCMAG, 23 Oct. 2024
To perform quantum experiments, physicists typically have to put atoms in vacuums or subject them to temperatures near absolute zero.
—Shayla Love, The Atlantic, 11 Oct. 2024
Like Luke Skywalker on Hoth cold–just a few degrees above absolute zero.
—Alex Knapp, Forbes, 27 Sep. 2024
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Word History
First Known Use
1798, in the meaning defined above
Dictionary Entries Near absolute zero
Cite this Entry
“Absolute zero.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/absolute%20zero. Accessed 22 Nov. 2024.
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
More from Merriam-Webster on absolute zero
Britannica.com: Encyclopedia article about absolute zero
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