Knowing something does not necessarily imply you know how to teach something. Take the concept of density. It’s very intuitive, and also a very common concept, but at the same time, there are intricacies to the understanding of density that are not obvious to the casual observer. So how do you teach those concepts to new students? You can start with this video. It outlines several measurement steps, including taring the weight of a graduated cylinder on a scientific digital scale and then weighing the mass of a given volume of liquid.

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