Using high pressure, Mao has even discovered the only known room-temperature liquid metal apart from mercury: sodium. Under high pressure the melting point of sodium falls to below room temperature, so it remains in a liquid state.
在高壓下，毛河光還發現除了水銀以外第二個液態金屬──鈉，鈉在高壓下的融點下降到室溫，成為液態。