than LLO over the entire temperature range; however, at the higher temperatures the viscosities of D»0 and H20 appear to approach each other. For example, at 5°the difference between the viscosity of D20 and H20 is 0.4628 cP while at 70°the difference is only 0.0693 cP. One might attribute the decrease in the difference between the of D20 and H20 to the formation of similar structure for D20 and H20 at high temperatures (i.e., if the larger of D20 is due to greater structure). The effect of temperature on the differences between the compressibilities of' DO and H>0 also agree with this suggestion (3,4,12).

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