Reference index
Concise engineering references with visible sources.
Reference pages explain when a formula applies, what assumptions matter, and which calculator to use next.
Fluids & Piping
Formula context, flow regimes, pressure loss, continuity, and pump-head guidance.
fluids / pipe-flowDarcy-Weisbach EquationUnderstand the Darcy-Weisbach equation for straight-pipe friction loss, including pressure loss, head loss, variables, and applicability.fluids / pipe-flowHead Loss Vs Pressure LossRelate fluid head loss to pressure loss and understand why density and gravity matter when converting between them.fluids / pipe-flowLaminar Vs Turbulent FlowInterpret pipe Reynolds number as practical regime guidance without treating transition cutoffs as exact physical boundaries.fluids / pipe-flowPipe Flow Continuity EquationUnderstand how volumetric flow rate, average velocity, and pipe area are related by Q = V A for full circular pipes.fluids / pumpsPump Head BasicsUnderstand pump head as energy per unit weight and how differential pressure converts to equivalent liquid head.
Engineering Statistics & Sample Size
Confidence intervals, margin of error, sample-size planning, normality, and nonconformance rates.
statistics / confidence-intervalConfidence Level Vs Confidence IntervalDistinguish confidence level, interval estimate, coverage interpretation, and common engineering misuse of confidence statements.statistics / proportionEstimating Proportion And Nonconformance RateEstimate a proportion, defect rate, or nonconformance rate from binary observations and understand the assumptions behind the result.statistics / margin-of-errorMargin Of ErrorUnderstand margin of error as confidence-interval half-width and how it changes with sample size, variability, and confidence level.statistics / normalityNormality AssumptionsUnderstand when normal and t methods for means are reasonable and when engineering judgment or fuller statistical review is needed.statistics / sample-sizePractical Sample Size PlanningChoose between mean and proportion sample-size methods for engineering measurements, inspections, and test planning.