The cooling of molten urea by air in the tower is called______________________?
Correct answer: A. prilling
- A. prilling
- B. evaporation
- C. condensation
- D. crystallization
Explanation
In a prilling tower, molten urea is sprayed from the top and cooled by an upward air current. The droplets solidify into small spherical particles called prills. Evaporation removes water or volatile material, whereas prilling specifically describes formation of the solid urea granules.
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About Polymers
Polymers are large molecules made from repeating monomer units joined by covalent bonds. The topic distinguishes addition polymers such as polyethylene, PVC and polystyrene from condensation polymers such as nylon and polyester, and relates chain structure to thermoplastics, thermosetting polymers, elastomers, properties, uses and environmental concerns.
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