What is the only physical difference between heavy water and pure water?

heavy water has greater density
heavy water is radioactive
heavy water is not translucent
heavy water conducts electricity
Heavy water contains deu­teri­um instead of common hy­dro­gen-1. In its pure form it has a density about 11% greater than water, but oth­er­wise, it is phys­i­cal­ly and chem­i­cal­ly similar. It is not ra­dioac­tive. Because of greater density and stronger hy­dro­gen-oxy­gen bonds, its behavior is slightly dif­fer­ent in some bio­chem­i­cal re­ac­tion­s. It may be toxic, but only when a large fraction of water (> 50%) in higher or­gan­isms is replaced by heavy water.

Answers distribution

heavy water has greater density
heavy water is radioactive
heavy water is not translucent
heavy water conducts electricity
answers
flagFinland
95%
1%
1%
2%
80
flagthe United Arab Emirates
90%
3%
2%
2%
77
flagItaly
89%
3%
3%
4%
91
flagSwitzerland
86%
3%
4%
6%
66
flagthe Netherlands
84%
6%
3%
5%
144
flagGreece
79%
9%
9%
2%
43
flagFrance
75%
10%
5%
10%
60
flagGermany
73%
10%
5%
9%
369
flagthe United Kingdom
72%
10%
6%
9%
884
flagSweden
71%
3%
10%
14%
56
flagPakistan
66%
12%
9%
10%
66
flagPoland
65%
11%
9%
12%
26403
flagAustralia
65%
13%
7%
10%
67
flagthe Philippines
62%
10%
8%
16%
59
flagNorway
62%
16%
8%
12%
56
flagthe United States
60%
14%
8%
14%
1108
flagRepublic of Ireland
57%
18%
3%
20%
83
flagCanada
57%
12%
11%
17%
70
flagUnknown
55%
11%
14%
18%
1650
flagIndia
53%
14%
10%
19%
580

Gender

men65%
women67%
heavy water has greater density
65%
67%
heavy water is radioactive
11%
9%
heavy water is not translucent
9%
9%
heavy water conducts electricity
13%
13%

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What is the only physical difference between heavy water and pure water?
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