A quantified spread of values attributable to a measured quantity, accounting for relevant measurement information and corrections.
Comparing an instrument indication with a reference of known value to establish their relation and its measurement uncertainty.
A force probe measures an applied force through a calibrated response. A bending beam with strain gauges is one realization; orientation and measurement calibration matter.
A balance that applies a compensating force to hold its load support near a reference position; the compensation signal measures the applied force.

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Figure 1.
Portrait of Jonathan Pearce
. Portrait identified on the National Physical Laboratory profile.

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A calibrated vessel used to infer a liquid's mass density from its mass and filled volume; see pycnometer density measurement for an inspected experiment and the accounting formula.

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Metrology by Ciro Santilli 40 Created 2024-12-13 Updated 2025-07-16