If only magnesium were less expensive. According to researchers at the Pacific Northwest National Laboratory (PNNL), based in Washington State, USA, the magnesium used in the production of lightweight alloys for cars and aeroplanes is seven times more costly than the steel employed in the same applications.ccording to researchers at the Pacific Northwest National Laboratory (PNNL), based in Washington State, USA, the magnesium used in the production of lightweight alloys for cars and aeroplanes is seven times more costly than the steel employed in the same applications.
Definition of polemic for English Language Learners. : 1  a strong written or spoken attack against someone else's opinions, beliefs, practices, etc. 2  polemics : the art or practice of using language to defend or harshly criticize something or someone.
Noun. 1  A verbal dispute or heated argument. We got into a silly quarrel about what food to order. Quarrels would not last long if the fault were only on one side. FranÃ§ois de La Rochefoucauld. John O'Sullivan, Former Thatcher speechwriter discusses Brexit, [Video], C-SPAN at The Heritage Foundation, June 2016. At 4'27.