Molten solder flows between the two base metals being soldered because ____.

Question

Quizplus · Accepted Answer

Molten solder flows between the two base metals being soldered because of capillary attraction. Capillary attraction is the ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity. It occurs due to the attractive forces between the liquid and the surfaces of the narrow spaces it's flowing through, which results in the liquid being drawn into those spaces.

Molten Solder Flows Between the Two Base Metals Being Soldered