Su11 Foamed
polystyrene: A mixture of few polystyrene and a lot of air
A Yoghurt beaker
and
foamed polystyrene are made of the same plastic material.
The beaker is mainly
polystyrene
(PS), most of the foamed material (EPS) is air locked in closed pores
of
polystyrene.
* Right: Both are
burning
with a black smoke.
* Left: Place a
piece
of foamed polystyrene (4 cm x 5cm x 5 cm =100 ml) on the left
side
of your scale and
balance it by the
bottom of a beaker. * Both samples have a weight of 1.4 g = 1400 mg.
* Middle:
Polystyrene
does not float in water.