Invented by Sorensen
Acid 6.9
Alkali 7.1 to 14
Lemon 2.4
Vinagiri 2.9
Beer 4.5
Urine 6
Milk 6.5
Acid rain 4 to 5.5
Saliva 6.5 to 7.2
Water 7
Tear 7.2
Blood 7.4
Sea water 8
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