Final answer:
A chemical peel with a pH between 0-2 is considered highly acidic, which is stronger than common acidic substances and is comparable to stomach acid, indicating that it should be used cautiously.
Step-by-step explanation:
A chemical peel with a pH between 0-2 is classified as highly acidic. The pH scale is utilized to measure the acidity or basicity of a solution, ranging from 0 to 14. A pH of 7 is neutral, like pure water, while values below 7 are acidic, and those above 7 are considered alkaline or basic. In the case of a chemical peel with a pH within 0 to 2, it is much stronger than everyday acidic substances like orange juice (pH ≈ 3.5) and is comparable to stomach acid (pH = 1 to 2), which is highly acidic. Thus, these peels must be used with care and professional guidance to avoid skin damage.