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
flagSwitzerland
15%
61%
5%
17%
39
flagItaly
0%
60%
10%
30%
30
flagthe Netherlands
2%
57%
2%
37%
45
flagIndia
13%
55%
14%
15%
1394
flagGermany
13%
55%
2%
28%
426
flagUnknown
6%
54%
11%
27%
87
flagIndonesia
3%
54%
16%
25%
31
flagPoland
10%
52%
3%
32%
29423
flagAustralia
13%
52%
8%
23%
135
flagMalaysia
10%
51%
16%
19%
77
flagPakistan
9%
50%
14%
23%
176
flagthe United Kingdom
12%
48%
7%
29%
566
flagthe United States
13%
46%
7%
31%
1509
flagAustria
15%
45%
1%
34%
70
flagthe United Arab Emirates
9%
45%
15%
30%
33
flagCanada
15%
44%
9%
28%
94
flagthe Philippines
13%
43%
14%
27%
161
flagNigeria
16%
42%
25%
16%
99
flagRepublic of Ireland
11%
31%
11%
46%
45
flagSingapore
11%
26%
11%
51%
45