AIM: TO INVESTIGATE THE FACTORS THAT CAUSE RUSTING IN IRONEQUIPMENT: FOUR TEST TUBE, TEST TUBE RACKS, A BUNG, FOUR IRON NAILS,BOILED WATER,TAP WATER,SALTY WATER, COOKING OIL,CALCIUM CHLORIDE.METHOD: 1.LABEL FOUR TEST TUBES A-D AND PLACE IN A TEST TUBE RACK.2. TEST TUBE CONTENTS A= IRON NAIL AND TAP WATERB= IRON NAIL AND SALTY WATER C= IRON NAIL, BOILED WATER, OILD= IRON NAIL AND CALCIUM CHLORIDE. SEALED WITH A BUNG.3. LEAVE THE TEST TUBES UNDISTURBED FOR AT LEAST THREE DAYS.