 
<translate> Njikọ hydrogen na-eme ka mmiri na-agbasawanye mgbe ọ kpọnwụrụ akpọnwụ. Deuterium, ma ọ bụ hydrogen dị arọ, bụ isotope nke hydrogen, ma ọ bụ atọm hydrogen nke e tinyere neutron. Njikọ nke ihe ahụ mgbe ọ dị arọ bụ Deuterium na-eme ka mmiri gbasaa mgbe ọ na-ajụ oyi. Azịza ikpeazụ: (H). <eng> Hydrogen bonds cause water to expand when it freezes. Deuterium, or heavy hydrogen, is an isotope of hydrogen, or a hydrogen atom with a neutron added. The bonds of that which when heavy is Deuterium cause water to expand when it freezes. The final answer: (H). 