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.
Celeriac (Apium graveolens var. rapaceum), also called turnip-rooted celery or knob celery, is a variety of celery cultivated for its edible roots, hypocotyl, and shoots. It is sometimes called celery root.