For the best answers, search on this site https://shorturl.im/aQnO1. The standard atmosphere (symbol: atm) is an international reference pressure defined as 101325 Pa and formerly used as a unit of pressure.
stringer - a member of a squad on a team; a first stringer; a second stringer. team, squad - a cooperative unit (especially in sports) player, participant - a person who participates in or is skilled at some game.
Most stairs have a support called a stringer running up the center. The stringer bears most of the load on the stair tread, transferring it to the other steps and risers. The simple solution is to drive a few screws through the tread and into the riser to draw the board in and keep it from moving against the nails.