how do the beads of sweat occur?
2 answers
The water comes from inside the body through the pores of the skin. Here is a site that give more information about it although much of the information is mathematical.
Sorry, I didn't post the site.
http://hyperphysics.phy-astr.gsu.edu/Hbase/thermo/sweat.html
http://hyperphysics.phy-astr.gsu.edu/Hbase/thermo/sweat.html