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
flagItaly
93%
4%
0%
1%
62
flagFinland
92%
2%
0%
5%
38
flagthe Netherlands
81%
9%
3%
6%
32
flagNew Zealand
80%
6%
0%
13%
15
flagthe United Arab Emirates
73%
5%
10%
10%
19
flagMalaysia
71%
9%
9%
9%
21
flagAustralia
70%
6%
11%
6%
44
flagthe Philippines
70%
6%
3%
20%
30
flagGermany
69%
9%
5%
11%
185
flagDenmark
66%
13%
6%
13%
15
flagFrance
64%
24%
0%
12%
25
flagPoland
63%
13%
9%
12%
12642
flagthe United Kingdom
63%
15%
7%
12%
435
flagNorway
61%
10%
10%
17%
39
flagPakistan
60%
13%
13%
11%
43
flagSpain
60%
20%
6%
6%
15
flagthe United States
56%
16%
9%
15%
836
flagIndia
55%
13%
9%
19%
378
flagCanada
54%
16%
10%
16%
48
flagRepublic of Ireland
47%
17%
8%
26%
34

Gender

men68%
women63%
heavy water has greater density
68%
63%
heavy water is radioactive
13%
12%
heavy water is not translucent
7%
10%
heavy water conducts electricity
10%
14%

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What is the only physical difference between heavy water and pure water?
1900
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