make nodular cast iron and as an additive in steel. flame lighter flints use misch metal (a rare earth alloy) containing lanthanum to produce sparks by friction. lanthanum is used in hydrogen sponge alloys, which take up to times their own volume of hydrogen gas. it is also used to make night vision goggles...
countries need to balance their budgets. february , : pm ist coronavirus outbreak | china says 'urgently needs' medical masks to tackle virus china's foreign ministry spokesperson hua chunying said in a briefing that what china 'urgently' needs at present are 'medical masks, protective suits, and safety goggles...