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  • Units and conversions

    Units are used to describe physical quantities. Being able to express units in the most appropriate way is crucial for scientific research, engineering, everyday tasks, and effective communication across measurement systems. If you expressed a quantity without a unit, it wouldn't mean much. Let's say that you tell a friend...

  • Working with physical quantities

    Chemistry often deals with quantities (amounts) of chemicals. How do we use units to describe them? What do moles have to do with chemistry? How do we measure the mass of different components in a chemical reaction? Unit conversions, the mole, and stoichiometry are explained here. Overview Units and conversions...