this post was submitted on 25 Sep 2023
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Mercifully, g=9.8 everywhere on Earth's surface, so we use weight interchangeably with mass, but yes, we should weigh ourselves in Newton: "I need to lose 10kg, so I can reach my ideal weigh of 700N" :P
Big nope. It depends not only on height, but also on density of stuff under ground.
What's the variation? Does it ever get to 9.9 or 9.7? It's a negligible "nope" for people weighing themselves :D
You can look up gravity survey maps but it's not a huge variation in the habitable altitudes