Just a suggestion to put your mind at ease.
I agree - I seriously doubt that what floor a person is one makes a difference in what a person weighs. Gravitational pull towards the center of the earth (what is effectively what we think of as "weight"), won't change even when 10 stories above ground level.
The variation you're seeing is more likely due to differences between the scales themselves, or (even more likely) the time of day that you're weighing yourself at home and then at work. Just with one scale in one place, weight measurement can vary by 5 pounds in a single day. The only way (that I know of) to get close to consistent measurements on a scale is to measure yourself at the same time on the same scale, just after going to the bathroom, and with no clothes on. Even then, there could be variation due to water retention or TTOM.
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