In the foreign exchange and futures markets, even if you don't have a commodity, you can make a profit by selling it. Trading orders that sell goods short are called empty orders.

Nickel is a transition metal element, almost silvery white, hard, ductile and ferromagnetic. The symbol of element is Ni, which is mainly used in alloys and catalysts. Nickel compounds are classified as a class of carcinogens.

Nickel has active chemical properties, is not easy to oxidize in air at room temperature, is not easy to react with concentrated nitric acid, slowly dissolves in dilute acid, is resistant to strong alkali, can be burned in pure oxygen, and emits dazzling white light.