What is the best conductor of heat? (at a temperature 20°C and relative humidity 50%)

Diamond
Water
Graphene
Cellulose
Graphene has many unusual properties. It is the strongest material ever tested,efficiently conducts heat and electricity and is nearly transparent. The material , isolated, and characterized in 2004 by Andre Geim and Konstantin Novoselov at the University of Manchester. Research was informed by existing theoretical descriptions of its composition, structure, and properties This work resulted in the two winning the Nobel Prize in Physics in 2010 "for groundbreaking experiments regarding the two-dimensional material graphene."
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Answers by country

Diamond
Water
Graphene
Cellulose
answers
flagthe Netherlands
0%
8%
84%
8%
25
flagVietnam
7%
14%
71%
7%
14
flagMalaysia
5%
20%
65%
10%
20
flagSingapore
15%
7%
57%
19%
26
flagthe United Kingdom
4%
15%
55%
22%
198
flagAustralia
7%
10%
55%
25%
85
flagFrance
0%
5%
52%
41%
17
flagIndia
18%
16%
50%
13%
660
flagPoland
6%
15%
47%
30%
4855
flagNigeria
25%
25%
45%
5%
120
flagGhana
12%
25%
43%
12%
16
flagAustria
10%
22%
42%
22%
49
flagthe United States
12%
22%
41%
21%
309
flagPakistan
15%
29%
40%
14%
71
flagGermany
10%
24%
35%
28%
233
flagCanada
13%
15%
35%
33%
51
flagRepublic of Ireland
7%
28%
28%
35%
14
flagGreece
5%
10%
26%
57%
19
flagthe Philippines
19%
44%
25%
10%
47
flagSri Lanka
35%
28%
21%
7%
14