Unit — Science definition
A defined reference used to express a measurement.
Where it is taught
- Metric Measurement, Units & Uncertainty — Inquiry, Measurement & Models, Science 6: Matter, Energy & Earth Systems, Grade 6
In use
One team had supplied thruster data in pound-force seconds, an imperial unit.
Metric Measurement, Units & Uncertainty
Questions using unit
Problem 1
Apply the unit independently: A 1.2 kg bag is described as 120 g. Correct the conversion and explain the direction. Give a reason and a relevant qualification.
Answer and explanation
1.2 kg = 1,200 g. A gram is smaller than a kilogram, so the numerical count grows when the same mass is expressed in grams.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 2
Which statement correctly uses unit in Metric Measurement, Units & Uncertainty?
- Writing more digits automatically improves measurement quality.
- A measurement without a unit is fully interpretable.
- unit: A defined reference used to express a measurement.
- One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation
unit: A defined reference used to express a measurement.
A defined reference used to express a measurement. The lengths are 6.5 cm and 6.4 cm, or 65 mm and 64 mm. The 1 mm difference is observed reading variation; the values do not establish a length exact to many decimal places. Check alignment and use the ruler’s scale consistently.