File:Buoyancy.svg · Wikimedia Commons · See Wikimedia Commons
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Buoyancy is an upward force that acts on objects in water or other fluids, and it matters because when this force equals the downward pull of gravity, an object can float at rest instead of sinking. Understanding buoyancy is important for explaining why some things float while others sink, and how ships and submarines are designed to stay afloat.
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Article · 中文
浮力是指物体在流体中受到的力，方向與其所受重力相反。浮力來自各表面受流体压力的差（合力）。浮力的单位是牛顿（N）。浮力的方向始终竖直向上。
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