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A liquid will not wet the surface of a ...

A liquid will not wet the surface of a solid if the angle of contact is

A

zero

B

equal to`45^(@)`

C

equal to`90^(@)`

D

greater than `90^(@)`

Text Solution

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The correct Answer is:
To determine the angle of contact at which a liquid will not wet the surface of a solid, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Angle of Contact**: The angle of contact (also known as the contact angle) is the angle formed between the tangent to the liquid surface and the solid surface at the point of contact. It is denoted by α (alpha). 2. **Identifying Wetting and Non-Wetting Conditions**: - If the angle of contact α is **less than 90 degrees**, the liquid tends to spread on the surface of the solid, indicating that the liquid wets the surface. - If the angle of contact α is **greater than 90 degrees**, the liquid does not spread on the surface, indicating that the liquid does not wet the surface. 3. **Conclusion**: Based on the above understanding, we can conclude that a liquid will not wet the surface of a solid if the angle of contact is **greater than 90 degrees**. ### Final Answer: A liquid will not wet the surface of a solid if the angle of contact is **greater than 90 degrees**. ---
To determine the angle of contact at which a liquid will not wet the surface of a solid, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Angle of Contact**: The angle of contact (also known as the contact angle) is the angle formed between the tangent to the liquid surface and the solid surface at the point of contact. It is denoted by α (alpha). 2. **Identifying Wetting and Non-Wetting Conditions**: - If the angle of contact α is **less than 90 degrees**, the liquid tends to spread on the surface of the solid, indicating that the liquid wets the surface. ...
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