A Law is a Bill That has been passed. once a bill is signed by the President or his veto is overridden by both houses it becomes a law and is assigned an official number.
Size ! The earliest computers used to literally fill a room with valves ans switches - the same computing power used in the first room-sized computers can now be found in a digital watch !
Some technologies involving gas laws include:-Hot Air balloons-Scuba diving equpiment-Airplanes-Welding-Neon and fluorescent lighting-Air bags-Making bread