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%
0%
3%
59
flagItaly
92%
4%
0%
2%
69
flagthe United Arab Emirates
82%
5%
5%
5%
35
flagthe Netherlands
76%
13%
4%
6%
46
flagFrance
74%
12%
2%
10%
47
flagGermany
72%
9%
5%
10%
249
flagMalaysia
72%
9%
9%
9%
22
flagGreece
72%
16%
11%
0%
18
flagDenmark
70%
10%
5%
15%
20
flagAustralia
68%
6%
11%
8%
45
flagthe United Kingdom
67%
13%
6%
11%
535
flagthe Philippines
67%
10%
5%
16%
37
flagUnknown
66%
13%
6%
12%
86
flagPoland
64%
13%
8%
12%
14612
flagNorway
64%
11%
8%
15%
45
flagPakistan
62%
13%
13%
11%
45
flagthe United States
57%
16%
9%
15%
904
flagRepublic of Ireland
55%
15%
6%
22%
45
flagIndia
54%
13%
10%
19%
428
flagCanada
53%
14%
9%
20%
54

Gender

men68%
women65%
heavy water has greater density
68%
65%
heavy water is radioactive
13%
11%
heavy water is not translucent
7%
9%
heavy water conducts electricity
10%
13%

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