GUNS

GUNS ARE VERY DANGEROUS THING WE DON,T HAVE TO USE IT OTHERWISE WE ONLY HAVE TO USE IT FOR OUR DEFENSE AND WE NEVER HAVE TO TAKE A GUN WITH US WHEN WE ARE GOING TO FIGHT IT CAN PUT INTO DIFFICULT SATUATION FIREARMS WERE INVENTED IN 1260 IN CHINA AFTER THAT CHINES HAD INVENTED THE GUN POWDER IN 9 CENTURY

EXAMPLE

REVOLVER IT IS A UNIQUE TYPE OF GUN IN WHICH THE ROTATING CYLINDER HOLD A NUMBER OF CARTRIDGES THE CYLINDER  REVOLVES TO ALIGN EACH CHAMBER WITH THE REAR OF THE BARREL HOLD THE CARTRIDGES AND CONTAIN TH PRESSURE (UP TO 65000 POUNDS PER SQUARE INCH OR 450 MPa) PRODUCE WHEN THE CARTRIDGES IS FIRED