I have to do a chem prelab for this week and two of the questions ask for specific reasons behind the procedure and method. Part of the lab procedure is to find the mass and volume of three glass rods- one small one, and two large ones with different lengths. Another step is to find the mass and volume of the two larger rods together. The entire lab is about finding a relationship between mass and volume so it's obvious why I have to find the individual masses but I'm stuck on why the mass and volume of the combined rods are important. Is it just to see if the relationship for the individual rods is constant even when applied to combined items?

Also would it be necessary to put down finding the combined mass/volume as a separate step or would it fall under the same step as finding the masses of the rods?

Also would it be necessary to put down finding the combined mass/volume as a separate step or would it fall under the same step as finding the masses of the rods?

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