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The angle of contact (θ) determines wetting behavior: an acute angle (strong attraction to the solid) causes spreading (wetting), while an obtuse angle (weak attraction) leads to droplet formation, as explained in the surface tension section.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
Mercury has an obtuse angle of contact with glass because its cohesive forces (between mercury molecules) are stronger than its adhesive forces with glass, causing it to form droplets rather than spread.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
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