Sebum is a chemical mediator secreted onto the surface of the skin, On the skin, sebum is an oily, slightly waxy material.
Any material with a known composition is a chemical. To put it another way, a chemical always consists of the same "substance." Some compounds occur in nature, such as water. Other chemicals are generated, such as chlorine (used for bleaching clothing or in swimming pools) (used for bleaching fabrics or in swimming pools). You are surrounded by chemicals in both your food and clothing. In actuality, you are composed of a wide range of chemicals.
A change in a chemical is referred to as a chemical reaction. A chemical reaction can be thought of more broadly as the process by which one or more compounds transform into one or more new ones. Physical changes, which don't affect the substance being changed, are distinct from chemical changes.
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