Units & Measurements
12 topics · 12 interactive simulations
Unit Conversion
Convert between SI and CGS units — see factor-of-10 conversions for length, mass, force, energy, pressure.
Significant Figures
Watch rounding in action — see how measurements round to the correct number of significant figures.
Rounding Error Accumulation
See how small rounding errors compound over repeated calculations.
Absolute & Relative Error
Compare measured value with actual to compute absolute, relative, and percentage errors.
Error Propagation (Add/Sub)
Visualize how absolute errors add when quantities are added or subtracted.
Error Propagation (Mul/Div)
See how relative errors add when quantities are multiplied or divided.
Dimensional Formula
Pick powers of M, L, T and see canonical physical quantities with matching dimensions.
Dimensional Equation Checker
Check whether a physical equation is dimensionally consistent across classical formulas.
Derivation by Dimensions
Walk through 4 classic derivations — pendulum period, Bohr radius, projectile range, gravitational force.
Vernier Caliper
Measure a length to 0.01 cm with a live vernier scale — MSR + VSD × LC.
Screw Gauge (Micrometer)
Measure thicknesses to 0.001 cm with a circular thimble with 50 divisions.
Least Count & Zero Error
Apply zero-error correction to raw instrument readings — both positive and negative zero error.