Which gas is called laughing gas?

ammonia
nitrous oxide
nitrogen dioxide
sodium oxide
Nitrous oxide (N2O), more commonly referred to as laughing gas, is used as a local sedation method, according to the California Dental Association (CDA). Nitrous oxide is effective as a sedative because it relaxes patients with the pleasurable feelings it emits. Nitrous oxide's usefulness also stems from how quickly it works and that its effects are reversible.
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Answers by country

ammonia
nitrous oxide
nitrogen dioxide
sodium oxide
answers
flagRepublic of Ireland
0%
90%
4%
0%
42
flagthe Netherlands
0%
77%
18%
3%
27
flagSouth Africa
9%
76%
14%
0%
21
flagPoland
6%
74%
14%
3%
4238
flagIndia
6%
74%
15%
2%
646
flagthe United Kingdom
6%
72%
16%
3%
252
flagPakistan
11%
70%
12%
3%
86
flagthe United States
8%
69%
15%
3%
400
flagAustralia
6%
69%
23%
1%
82
flagFrance
5%
63%
26%
5%
19
flagthe United Arab Emirates
4%
58%
12%
16%
24
flagCanada
8%
55%
30%
3%
60
flagNigeria
12%
53%
32%
2%
131
flagMalaysia
14%
53%
28%
3%
28
flagGhana
16%
51%
16%
12%
31
flagGermany
7%
50%
33%
5%
909
flagItaly
11%
44%
40%
3%
27
flagAustria
6%
43%
37%
10%
146
flagthe Philippines
27%
40%
16%
11%
61
flagSwitzerland
5%
36%
48%
10%
80