Addition Polymers. Addition polymers such as polyethylene, polypropylene, poly(vinyl chloride), and polystyrene are linear or branched polymers with little or no cross-linking. As a result, they are thermoplastic materials, which flow easily when heated and can be molded into a variety of shapes.
According to what I have read a stalk of celery is the whole bunch....a rib, is one of the many that make up the stalk....so many of the recipes are really wrong when th â¦ ey say one stalk....you would have way too much celery.
Confidence votes 2.5K. Unlike many other vegetables, celery is relatively high in salt (sodium). The average stalk of celery contains about 35 mg of sodium. Those on a diet of 1000 mg or less of sodium may wish to avoid celery and choose a lower-sodium vegetable.