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%
51
flagItaly
93%
4%
0%
1%
63
flagthe United Arab Emirates
79%
4%
8%
8%
24
flagthe Netherlands
76%
11%
4%
7%
42
flagSingapore
76%
5%
11%
5%
17
flagUU
75%
11%
2%
11%
45
flagMalaysia
72%
9%
9%
9%
22
flagGermany
71%
8%
5%
11%
207
flagFrance
71%
17%
0%
11%
35
flagAustralia
70%
6%
11%
6%
44
flagthe Philippines
70%
8%
2%
17%
34
flagDenmark
68%
12%
6%
12%
16
flagthe United Kingdom
64%
14%
7%
12%
469
flagPoland
63%
13%
9%
12%
13639
flagNorway
63%
11%
9%
15%
44
flagPakistan
62%
13%
13%
11%
45
flagthe United States
57%
16%
9%
15%
877
flagIndia
55%
13%
9%
19%
397
flagRepublic of Ireland
53%
14%
7%
24%
41
flagCanada
52%
15%
9%
20%
53

Gender

men69%
women64%
heavy water has greater density
69%
64%
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?
1985
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