All substances have different pH levels. The pH level is just a measure of the acidity of a substance. A pH level of 7 would indicate that the substance in question is neither acidic or basic, water is commonly given as having a pH level of 7, (though tap water is often slightly lower due to the chlorine content). The scientific answer to your question would be that the pH level would be different due to the variance in the number of free hydrogen atoms or protons, in the different cosmetics.
The pH level of different plants can be sometimes found in a pH tester. I have a chart that has probably a hundred different plants with all different suggested pH's. You can go to any search engine and type in "What is the suggest pH for [plant so and so]" and you'll find all you need about the plant's suggested pH. I hope this helped.
Our drinking water PH level varies between 6.5 and 9.5.the safest PH level of drinking water would be 7 which is the PH level of PURE WATER.When water has a low pH level it is called "soft water." Soft water is more acidic; with the pH between 6 and lower, it can be harmful to metals and cause stain in clothes. When water has high pH level, it is "hard water." Hard water isn't harmful but can cause many things. Hard water has a bad taste and it causes build up on plumbing. Hard water can also create a strange appearance to your clothing and dishware and even make your hair look dull. PH levels of water cannot affect your health largely but it can cause problems.
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