What is inside Swiss cheese holes?

nitrogen
carbon dioxide
water vapor
air
Carbon dioxide is produced by bacteria feeding on the lactic acid. In the Middle Ages, the holes were considered a sign of imperfection and cheese makers would try to avoid them.
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Answers by country

nitrogen
carbon dioxide
water vapor
air
answers
flagNew Zealand
10%
70%
5%
15%
20
flagGermany
12%
60%
2%
25%
148
flagIndia
13%
55%
13%
16%
1061
flagIndonesia
3%
55%
11%
29%
27
flagUnknown
6%
54%
11%
27%
87
flagPakistan
9%
53%
12%
22%
138
flagthe Netherlands
0%
53%
3%
42%
28
flagNigeria
12%
52%
25%
10%
40
flagPoland
10%
51%
3%
33%
27319
flagMalaysia
11%
50%
16%
21%
60
flagGreece
0%
50%
9%
40%
22
flagthe United Kingdom
11%
49%
9%
29%
432
flagthe United Arab Emirates
10%
48%
17%
24%
29
flagthe United States
13%
46%
7%
30%
1366
flagCanada
14%
45%
9%
28%
83
flagAustralia
17%
44%
9%
26%
96
flagthe Philippines
15%
41%
14%
25%
131
flagAustria
16%
38%
0%
41%
31
flagRepublic of Ireland
14%
33%
14%
37%
27
flagSingapore
12%
24%
12%
51%
41