The Oil Lamp principle is associated with which physical concept?

The Oil Lamp principle is associated with which physical concept?

• A. Conduction
• B. Diffusion
• C. Refraction
• D. Capillarity

Answer: (D)

Capillarity is the rise of a liquid in tiny spaces due to surface tension and the interaction between the liquid and solid surface. In an oil lamp, the wick provides many narrow channels. The oil wets the wick because of adhesive forces between the oil and the wick fibers, along with cohesive forces within the oil. These forces pull the oil upward through the tiny pores, lifting fuel toward the flame against gravity. The steady supply depends on the wick’s pore size, the oil’s properties, and the contact between them. This is different from conduction (heat transfer through a material), diffusion (spreading due to concentration differences), or refraction (bending of light at interfaces), which do not describe how liquid moves through a wick.

Capillarity is the rise of a liquid in tiny spaces due to surface tension and the interaction between the liquid and solid surface. In an oil lamp, the wick provides many narrow channels. The oil wets the wick because of adhesive forces between the oil and the wick fibers, along with cohesive forces within the oil. These forces pull the oil upward through the tiny pores, lifting fuel toward the flame against gravity. The steady supply depends on the wick’s pore size, the oil’s properties, and the contact between them. This is different from conduction (heat transfer through a material), diffusion (spreading due to concentration differences), or refraction (bending of light at interfaces), which do not describe how liquid moves through a wick.