The main raw material for manufacturing flat glass is sand (silicon dioxide, also called silica). However, two other materials?sodium oxide, and lime (calcium oxide)?are added to silica. What are their roles?
What will be an ideal response?
Sodium oxide lowers the meting point of sand and also makes molten sand more workable, i.e., less tacky. Lime
increases the durability of glass by making it more resistant to chemicals.
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A gauze air filter must be oiled to work properly.
Answer the following statement true (T) or false (F)
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