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
94%
1%
1%
2%
78
flagItaly
90%
3%
3%
2%
84
flagthe United Arab Emirates
88%
5%
3%
3%
60
flagthe Netherlands
80%
8%
4%
7%
97
flagGreece
79%
7%
10%
2%
39
flagFrance
73%
11%
3%
11%
52
flagMalaysia
73%
11%
7%
7%
26
flagGermany
72%
10%
5%
9%
324
flagthe United Kingdom
71%
10%
6%
9%
816
flagDenmark
70%
8%
4%
16%
24
flagNorway
66%
11%
9%
13%
53
flagthe Philippines
66%
8%
6%
17%
45
flagPoland
65%
12%
9%
12%
23740
flagAustralia
64%
12%
8%
10%
56
flagPakistan
62%
15%
11%
9%
53
flagRepublic of Ireland
60%
19%
4%
16%
73
flagthe United States
59%
15%
8%
14%
1045
flagUnknown
55%
11%
14%
18%
1530
flagIndia
55%
13%
9%
19%
495
flagCanada
55%
13%
11%
17%
67

Gender

men65%
women67%
heavy water has greater density
65%
67%
heavy water is radioactive
11%
10%
heavy water is not translucent
10%
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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