Why is Teflon coated on non-stick frying pans? Explain.
(N/A) Teflon is a polymer known as polytetrafluoroethylene $(PTFE)$.
It has a very low surface energy,which results in a high angle of contact between the surface of the pan and liquids like oil or water.
Because the angle of contact is obtuse $(> 90^{\circ})$,the adhesive forces between the liquid and the Teflon surface are much weaker than the cohesive forces within the liquid.
Consequently,the liquid does not wet or stick to the surface,making the pan non-stick.
It has a very low surface energy,which results in a high angle of contact between the surface of the pan and liquids like oil or water.
Because the angle of contact is obtuse $(> 90^{\circ})$,the adhesive forces between the liquid and the Teflon surface are much weaker than the cohesive forces within the liquid.
Consequently,the liquid does not wet or stick to the surface,making the pan non-stick.
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Given below are two statements: One is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Clothes containing oil or grease stains cannot be cleaned by water wash.
Reason $(R)$: Because the angle of contact between the oil/grease and water is obtuse.
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Assertion $(A)$: Clothes containing oil or grease stains cannot be cleaned by water wash.
Reason $(R)$: Because the angle of contact between the oil/grease and water is obtuse.
In the light of the above statements,choose the correct answer from the options given below.
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