In micro/nanoscale devices ,liquid meniscus is formed between solid surfaces ,when they are brought into contact or at a small separation .T he meniscus force and viscous force ,inducing by the liquid meniscus ,are the substantial causes leading to the precision decrease and the failure of devices .A physi-cal model of micro/nanoscale sphere-on-flat surface was put forward here .Based on the Young-Laplace equation and Reynolds lubrication theory ,the meniscus force and viscous force formulae were deduced . During the separation of the sphere and flat surfaces ,the variations of meniscus shapes...
