Measurement uncertainty in lab reports
State what the uncertainty represents, how it was obtained, and how it propagates into derived quantities.
Name the uncertainty
A number after ± is ambiguous without context. State whether it is instrument resolution, standard deviation, standard error, confidence interval, or a combined standard uncertainty.
Match units and precision
Absolute uncertainty carries the same unit as the quantity. Report the value to a precision consistent with the uncertainty and retain fuller precision in the calculation record.
Propagate with assumptions visible
Root-sum-square rules generally assume independent inputs and linearized behavior. Correlation or nonlinear models require a more complete method.
Keep uncertainty distinct from disagreement
Measurement uncertainty describes dispersion or knowledge about a value; percent error compares an observation with a reference. Neither automatically establishes method validity.
Sources and boundaries
Solice develops LabCrux. The independent sources above do not sponsor or endorse the product. This page explains a review method; your experimental evidence, course instructions, and instructor remain authoritative.