As the core heats the oil, the oil ________.

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Multiple Choice

As the core heats the oil, the oil ________.

Explanation:
When a fluid is heated, it becomes less dense because its molecules move faster and take up more space. The warmer oil therefore becomes buoyant compared to the cooler oil around it. That buoyancy causes the heated oil to rise through the surrounding oil, creating a convection current. So, as the core heats the oil, the oil rises. Expansion can happen with heating, but it’s the decrease in density and the resulting buoyancy that determines the vertical motion, not vaporization (which would require reaching boiling temperatures).

When a fluid is heated, it becomes less dense because its molecules move faster and take up more space. The warmer oil therefore becomes buoyant compared to the cooler oil around it. That buoyancy causes the heated oil to rise through the surrounding oil, creating a convection current. So, as the core heats the oil, the oil rises. Expansion can happen with heating, but it’s the decrease in density and the resulting buoyancy that determines the vertical motion, not vaporization (which would require reaching boiling temperatures).

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