The second spider sank because it was heavier.
Surface tension is the propensity for liquid surfaces that are at rest to condense into the smallest surface area. Razor blades and insects (like water striders), which have a higher density than water, can float on the surface of the water without even becoming partially buried because to surface tension. Surface tension at liquid-air contacts originates from the liquid molecules' stronger attraction to one another due to cohesion than to the air molecules (due to adhesion). There are primarily two mechanisms at work. One causes the liquid to constrict by exerting an inward push on the surface molecules.
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