Inside an oil lamp, fuel ascends through the wick due to what phenomenon?
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Answer: A. Capillary action
Explanation
Capillary action enables liquid fuel to climb upward through tiny spaces inside the lamp wick. Adhesion between the oil molecules and wick fibers overcomes gravity to sustain a steady upward flow. Cohesive forces within the liquid fuel maintain a continuous column as it travels toward the flame. Capillary action occurs when liquid flows through narrow spaces without the assistance of external forces. Surface tension and intermolecular forces play vital roles in drawing liquids upward against gravitational pull. This physical phenomenon is commonly observed in plant stems, paper towels, and narrow glass tubes.
Capillary action is essential for transporting water and nutrients from roots upward through tall trees. Medical professionals use capillary tubes to draw small blood samples for quick diagnostic laboratory tests. Understanding this principle helps engineers design better moisture-wicking fabrics for athletic clothing applications. Atmospheric pressure pushes gases and fluids down rather than drawing fuel upward inside a lamp wick. Viscosity describes a fluid resistance to flow and does not provide any driving force for movement. Temperature changes can alter fluid density and viscosity but do not directly power upward liquid transport.
- Subject
- Everyday Science
- Category
- Everyday Science
- Topic
- —
- Difficulty
- medium
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