hi burrman,

i've updated the spreadsheet several times. this most recent update, i should mention something. brian's earlier post was comparing 2.2oz vs 2.0oz. that leads to a 10% diff in density or volume. Later, you compared 7.2oz to 7.02oz. that leads to a 2.56% diff in density or volume. the math is the same, it's just what two numbers are being compared. I added this into the spreadsheet. in reality; mass, density, and volume are all unknown to some degree. so you end up going in circles. you have to at least lie to yourself a little and say you know two things, in order to 'measure' the third thing. you can't not know all three things. there is only one equation so you can only have one unknown.

i think someone mentioned this, but you said your measurements are in ounces. so technically you are measuring mass, if the units are right. however, a lot of scales are measuring weight and reporting mass. so it gets confusing. also people say weight when they should say mass and vice versa. i used the word weight in the spreadsheet to match what you were saying. but the units are in mass, which is what you were also saying. i think i know what you mean. it's just weird. i also switched to inputting grams because the scales seem to work better in metric. all labs use metric as well. you can change the spreadsheet as you see fit though.