Which of the following pair is INCORRECT? I. Parsec - Distance II. Barrel - Liquid III. Light year – Time
Only III
A parsec is a unit of astronomical distance (~3.26 light-years), so I is correct. A barrel is a unit of volume, commonly used for liquids such as crude oil (1 barrel = 42 US gallons ≈ 159 L), so II is correct. A light year is the distance light travels in vacuum in one year (\(\approx 9.46\times 10^{15}\) m); despite the word ‘year’ in its name, it measures distance, not time. Hence only pair III is incorrect.
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