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Scales read your weight by how much gravity pulls on your body. The scale can only measure the pull of gravity by how much the scale itself is compressed. When you have one foot off the scale, and since gravity pulls straight down, gravity will be pulling the off-scale foot down to the side of the scale, not directly on it. This makes the scale compress less, because gravity is pulling you from another point not directly above the scale.

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Q: Why do scales read differently if you stand on one or two?
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