The content of gold alloys is expressed in 24ths, called karats; thus, a 12 - karat gold alloy is 50 percent gold, 18 - karat gold is 75 percent gold, and 24 - karat gold is pure.
एक आउंस सोने को ७० किलोमीटर लंबा फैलाया जा सकता है ।