Differences between mass and charge

  1. Charge is of two types, mass is only of one kind
  2. There are two types of forces (attraction and repulsion) between charges, but there is only one kind (attraction) between masses
  3. Charge is quantized, but quantization of mass is not established so far
  4. Charge has SI unit coulomb, the SI unit of mass is kg
  5. Charge is conserved, but mass alone is not conserved (Mass + Energy is conserved)
  6. Charge cannot exist without a mass, but mass can exist without a net charge

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