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Reference.org
Sodium–potassium alloy
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<p>Sodium–potassium alloy, colloquially called NaK (commonly pronounced /næk/), is an <a href="/facts/Alloy/I7w7WQWR">alloy</a> of the <a href="/facts/Alkali_metals/IkWbCLk2">alkali metals</a> <a href="/facts/Sodium/eYuSPu2V">sodium</a> (Na, <a href="/facts/Atomic_number/bgAr581S">atomic number</a> 11) and <a href="/facts/Potassium/FWPwS7Rj">potassium</a> (K, atomic number 19) that is normally liquid at room temperature. Various commercial grades are available. NaK is highly reactive with water (like its constituent elements) and may <a href="/facts/Pyrophoricity/1b8Sl2AJ">catch fire when exposed to air</a>, so must be handled with special precautions. </p>