JAMB - Physics (2023 - No. 58)
When a water droplet is placed on a freshly cut piece of wood, it spreads out to form a thin layer because the wood is
not at equilibrium with the water
cohesive to water
at equilibrium with the water
adhesive to water
Paaiškinimas
Adhesive surfaces are surfaces that are wetted by water. This means that the water molecules are attracted to the wood surface, and they spread out to form a thin layer in order to maximize their contact with the surface. The adhesive forces between the water molecules and the wood surface are stronger than the cohesive forces between the water molecules, resulting in a thin layer.