最大气泡法测定表面张力的公式σ=(r/2)△P_(max)(σ是表面张力、r是毛细管半径、△P_(max)是最大压力差)可用三种方法导出: 第一种方法,根据气泡鼓出时所需的高于外部气压的附加压力与弯曲液面指向曲率中心的附加压力相平衡,△P=(2σ)/R,气泡成半球形时R最小,且等于毛细管的半径r,此时△P有最大值△P_(max),所以△P_(max)=(2σ)/r,σ=(r/2)△P_(max)。此法已有叙述,①不再。重复 The maximum bubble method for the determination of surface tension σ = (r / 2) △ P_ (max) (σ is the surface tension, r is the capillary radius, △ P max is the maximum pressure difference) can be derived using three methods: The first Method, which balances the additional pressure above the outside air pressure required for bubble expansion with an additional pressure at the center of curvature of the curved liquid surface, ΔP = (2σ) / R, with the smallest hemispherical bubble R equal to the capillary The radius r, then △ P has the maximum △ P_ (max), so △ P_ (max) = (2σ) / r, σ = (r / 2) △ P_ (max). This law has been described, ① no longer. repeat