Addition polymers form by simply adding monomers without losing small molecules, like polyethylene. Condensation polymers, like nylon 6,6 or Bakelite, form with the loss of small molecules like water. So, the key difference is *by-product formation*. Honestly, I remember this because making nylon 6,6 in the lab felt like the tricky 'rope trick' I use to make perfect *singju* salad—everything has to combine just right, and you're left with something else in the bowl.
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