When two different objects come into contact with each other, one becomes positively charged by losing some electrons, while the other becomes negatively charged by gaining some surplus electrons. If the charge is difficult to neutralize during the separation process, the charge will accumulate and cause the object to carry static electricity. So when objects come into contact with other objects and separate, they will bring static electricity. Typically, stripping a plastic film from an object is a typical "contact separation" electrification, and the static electricity generated by undressing in daily life is also "contact separation" electrification.
Solids, liquids and even gases can be electrostatic by contact separation. This is because the gas is also composed of molecules, atoms, when the air flow molecules, atoms will also occur "contact separation" and electricity.
We all know about triboelectrification but rarely hear about contact electrification. In essence, triboelectrification is a process of contact and separation that causes the imbalance of positive and negative charges. Friction is a process of constant contact and separation. So triboelectrification is essentially contact separation electrification. In daily life, all kinds of objects may produce static electricity due to movement or friction.
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