Magnesium - siver-white very easy metal, almost in 5 times is easier some copper, in 4,5 times it is easier some iron; even aluminium in 1,5 times is heavier some magnesium. To fuse magnesium at 651°C, but in usual conditions to fuse it(him) it is rather difficult: heated up on air up to 550°C, it(he) flashes and instantly burns down is dazzling a bright flame. It is easy to burn to a strip of a magnesian foil an ordinary match, and in an atmosphere of chlorine magnesium ignites spontaneously even at room temperature.
Alloys on the basis of magnesium are the important constructional material in the automobile and aviation industry due to their ease and durability.