The rise of mercury in a thermometer is due to:
Correct answer: A. Thermal expansion
- A. Thermal expansion
- B. Gravity
- C. Condensation
- D. Capillary action
Explanation
The rise of mercury in a thermometer is primarily due to thermal expansion. When mercury is heated, it expands and takes up more space, causing it to rise within the narrow tube of the thermometer. This phenomenon is used to measure temperature changes. The other options are incorrect: Gravity doesn't influence the rise of mercury in this context; Condensation involves a phase change from gas to liquid, unrelated to mercury's behavior; and Capillary action refers to liquid movement in narrow spaces due to surface tension, not affecting thermometer readings.
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Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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