Particles and moles

IB Physics: Particles and moles

I always try to introduce some chemistry here (I don"t know much chemistry so it has to be simplifies into atom A combining with atom B etc.) to try and get across the way that scientists originally found out the relative mass of different atoms. Students taking chemistry often help me out here with some actual examples.Using examples like "a dozen eggs" helps get across the idea that we sometimes use number of objects...

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