Which quantity is measured in seconds in SI units?

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Multiple Choice

Which quantity is measured in seconds in SI units?

The main idea is identifying which quantity has seconds as its SI unit. Time is the quantity that is measured in seconds in the SI system. The second is one of the SI base units and specifically represents duration or how long something lasts. Other quantities use different base units: distance is measured in meters, and mass in kilograms. Velocity uses seconds as part of its unit (meters per second) because it’s a rate of distance per time, but the unit is not just seconds. So time is the quantity defined by the second.

The main idea is identifying which quantity has seconds as its SI unit. Time is the quantity that is measured in seconds in the SI system. The second is one of the SI base units and specifically represents duration or how long something lasts. Other quantities use different base units: distance is measured in meters, and mass in kilograms. Velocity uses seconds as part of its unit (meters per second) because it’s a rate of distance per time, but the unit is not just seconds. So time is the quantity defined by the second.

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