If we remove the atmosphere, will our weight be the same ? So why isn't our weight = gravity + pressing force from atmosphere. The air is pressing us! Bonus question: do we need to include atm when calculating buoyancy?

Question

festinger · Answer

Pressure acts in all direction on us. Pressure pushes us from the top, it pushes up on us from the bottom. It pushes us from the left and on the right!

So unless the object is significantly high and you require the measurement to a high degree of accuracy, you can ignore pressure from atmosphere.

I cannot generalise and say that we can ignore atm, but in most cases since buoyancy is the weight of water displaced, we can ignore atm. This is because buoyancy is the difference in pressure that causes this upthrust, and both the "top" and "bottom" pressure terms have the same atm term, which cancels out.

anonymous · Answer

weight=m*g
atm pressure has nothing to do with it
nor with bouyant force

theeric · Answer

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