Physics
Units, Dimensions and Measurement Explained
By Dr. Sandhya Classes Editorial Team · Published 2026-10-03 · Updated 2026-10-03 · 3 min read
SI units, dimensional analysis, significant figures and errors for Class 11 Physics.
Physics at Dr. Sandhya Classes is taught personally by Dr. Sandhya, Ph.D. in Physics, teaching since 2015 — offline in Zirakpur (Highland Marg & Lohgarh Road) and online across India. About Dr. Sandhya
SI units
Every physical quantity needs a unit; learn base and derived SI units thoroughly.
Dimensional analysis
Use dimensions to check equations, convert units and derive relations.
Significant figures
Precision in reporting matters in both theory and practical exams.
Errors in measurement
Absolute, relative and percentage errors appear in boards and entrance exams.
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