笔者认为,用天平称量质量较小而体积又相对较大的物体的质量时,宜考虑该物体的体积与所用砝码的体积是否相差很大,空气浮力对称量的影响是否可忽略的问题.根据阿基米德定律:浸没在流体里的物体受到流体的浮力等于该物体排开流体所受的重力,即f=ρVg式中,ρ为流体密度,V为物体的体积,g为 The author believes that when using a balance to weigh the mass of a relatively small mass and a relatively large volume, it is appropriate to consider whether the volume of the object is very different from the volume of the mass used, and whether the effect of the symmetry of air buoyancy is negligible. According to Archimedes’ law, the immersion of an object in a fluid by the buoyancy of the fluid is equal to the gravity of the fluid discharged by the object, ie, f = ρVg where ρ is the density of the fluid, V is the volume of the object, and g is