Definition of absolute zero
: a theoretical temperature characterized by complete absence of heat and motion and equivalent to exactly −273.15°C or −459.67°F
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Recent Examples of absolute zero from the Web
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Each tower will contain six crystals slotted into their own units, and the four towers will be placed in a cryogenic container called the SNOBOX to cool the experiment to near absolute zero.
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The exotic devices operate at temperatures close to absolute zero.
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Folded up for launch, the five-layer sun shield is required to produce the ultra-low temperatures -- 50 degrees above absolute zero -- that Webb's sensitive optics and instruments require to capture faint infrared emissions.
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To create the condensate, other cooling techniques are used to push the cloud even closer to absolute zero—including creaming off the most energetic atoms using a radio-wave ‘knife’ and widening the trap to let the cloud expand.
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The researchers connected the chips with an optical fiber and cooled the whole setup close to absolute zero to damp out vibrations.
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One piece of equipment that the rocket will carry is the Cold Atom Laboratory, which will use magnetic fields and lasers to create clouds of atoms called Bose-Einstein condensates (BECs), cooled to just above absolute zero.
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That’s long enough for them to be cooled to record-low temperatures—perhaps as little as 20 trillionths of a degree above absolute zero.
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Researchers have used lasers to get things down to millionths of a degree above absolute zero.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'absolute zero.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of absolute zero
1798
ABSOLUTE ZERO Defined for English Language Learners
absolute zero
Definition of absolute zero for English Language Learners
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: the temperature that is believed to be the lowest possible temperature
Medical Dictionary
absolute zero
medical Definition of absolute zero
: a theoretical temperature characterized by complete absence of heat and equivalent to exactly −273.15°C or −459.67°F
Learn More about absolute zero
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Britannica.com: Encyclopedia article about absolute zero
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