Which term defines the attractive forces between a liquid and a solid surface?

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Prepare for the Surface Methods - Liquid Penetrant Inspection (LPI) Exam. Utilize flashcards and multiple-choice questions with detailed hints and explanations. Ace your exam with confidence!

Multiple Choice

Which term defines the attractive forces between a liquid and a solid surface?

Explanation:
Adhesion is the attractive force between a liquid and a solid surface. It explains why the liquid sticks to and wets the surface, allowing it to spread and enter tiny flaws along the interface, which is essential in penetrant testing. Diffusion is about molecules moving from high to low concentration, not about interactions with a surface. Viscosity is the liquid’s internal resistance to flow, and cohesion is the attraction between molecules within the liquid itself. If adhesion is strong, the liquid wets the surface well; if cohesion dominates, the liquid tends to bead up and resist wetting.

Adhesion is the attractive force between a liquid and a solid surface. It explains why the liquid sticks to and wets the surface, allowing it to spread and enter tiny flaws along the interface, which is essential in penetrant testing.

Diffusion is about molecules moving from high to low concentration, not about interactions with a surface. Viscosity is the liquid’s internal resistance to flow, and cohesion is the attraction between molecules within the liquid itself. If adhesion is strong, the liquid wets the surface well; if cohesion dominates, the liquid tends to bead up and resist wetting.

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