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Liquid ammonia has a very high standard enthalpy change of vapourization (23.5 kJ/mol; [28] for comparison, water's is 40.65 kJ/mol, methane 8.19 kJ/mol and phosphine 14.6 kJ/mol) and can be transported in pressurized or refrigerated vessels; however, at standard temperature and pressure liquid anhydrous ammonia will vaporize.
[8] After Caligula's death, Claudius became the new emperor. Nero's mother married Claudius in AD 49, becoming his fourth wife. [i] [4] On 25 February AD 50, [ii] Claudius was pressured to adopt Nero as his son, giving him the new name of "Nero Claudius Caesar Drusus Germanicus". [iii] [12] Claudius had gold coins issued to mark the adoption. [13]