浮力

1. Origins, structure, and basic meaning

• Structure: 浮力 is read as ふりょく and is a physics noun for buoyancy, the upward force exerted on an object in a fluid such as water or air.
• Basic usage: Use 物体に働く浮力 for the object receiving the force and 浮力で体を水面に保つ for buoyancy as the means.

2. Common pitfalls and similar expressions

• Force and floating result
  • 浮力 is the upward force itself; whether an object actually floats also depends on its weight and other conditions.
• Roles of the particles
  • に marks the object on which the force acts, while で marks buoyancy as the means by which a life jacket keeps someone at the surface.