(J/mol∙K)
T (K)	LaH₂	CeH₂	PrH₂	NdH₂	SmH₂
213.15	−160.957	−158.885	−155.180	−153.755	−154.178
223.15	−163.321	−161.107	−157.475	−156.189	−156.703
233.15	−165.571	−163.233	−159.661	−158.510	−159.113
243.15	−167.715	−165.262	−161.745	−160.728	−161.412
253.15	−169.764	−167.206	−163.744	−162.852	−163.614
263.15	−171.728	−169.074	−165.656	−164.894	−165.726
273.15	−173.603	−170.866	−167.491	−166.852	−167.747
283.15	−175.407	−172.596	−169.256	−168.736	−169.693
303.15	−178.806	−175.875	−172.589	−172.297	−173.374
313.15	−180.406	−177.423	−174.165	−173.981	−175.109
323.15	−181.955	−178.927	−175.689	−175.613	−176.790
333.15	−183.445	−180.384	−177.160	−177.192	−178.415
343.15	−184.887	−181.795	−178.582	−178.717	−179.985
353.15	−186.282	−183.165	−179.962	−180.201	−181.506
363.15	−187.627	−184.492	−181.296	−181.633	−182.980
373.15	−188.931	−185.779	−182.588	−183.026	−184.408