Usinglaserpulsesand ultra-coldtemperatures,physicistswereabletoobserveatomsflyingtogether in theshapeof acube.
Iceformedon thetankwhen it wasfilledwith ultracoldliquidoxygenandhydrogen.
Theyranacurrentthrough thegel,cooledit with ultracoldliquidhelium, and thatallowedthem towitnesssuperconductivity.
SMART Vocabulary: related words and phrasesCold
Baltic
be (as) cold as iceidiom
bitter
bitterly
bone-chilling
cold snap
coldness
cooling
crispness
dank
frozen
glacial
nuclear winter
polar vortex
post-glacial
refrigerated
sharpness
starving
stone-cold
vitrification
See more results ?(Definition ofultracoldfrom theCambridge Advanced Learner's Dictionary & Thesaurus? Cambridge University Press)#https://dictionary.cambridge.org//dictionary/english/ultracold##