PennsylvaniaStateUniversityphysicistsMosesChanandEun-SeongKimbelievetheyhavecreatedanewphaseofmatter-a"supersolid"thatflowslikeliquid.Theycompressedliquidhelium-4intoasponge-likeglassdiscriddledwithatom-sizedpores,whilechillingittoafractionofadegreeabovealmostabsolutezero(-273Celsius).Theporousglasswasheldinsidealeak-tightcapsule,whosepressurewasgraduallyincreased.Whenitreached40timesatmosphericpressure,theheliumbecameasolid.
（美國）賓夕凡尼亞州立大學物理學家MosesChan和Eun-SeongKim聲稱創造了一種物質的新狀態──像液體般流動的「超固體」。他們將液態的氦-4壓縮成海綿般、滿布微孔的玻璃圓片，將溫度減至接近絕對零度（攝氏零下273度），放入密封容器，並逐漸增加容器內壓力，直至達到大氣壓力40倍，氦-4變成固體。