Mixtures and solutions in which the ratio of the number of deuterium atoms to normal hydrogen atoms exceeds 1 : 5000.
Meascáin agus tuaslagáín inar mó ná 1:5,000 an coibhneas idir uimhir na n-adamh deoitéiriam agus uimhir na n-adamh normalach hidrigine. gine.