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 / waterCommon Water Properties For Engineering CalculationsSelect density, viscosity, vapor pressure, heat capacity, and thermal conductivity at the actual water temperature and pressure instead of relying on one room-temperature value.fluids / pipe-flowDarcy-Weisbach EquationUnderstand the Darcy-Weisbach equation for straight-pipe friction loss, including pressure loss, head loss, variables, and applicability.fluids / viscosityDynamic Vs Kinematic ViscosityChoose the correct viscosity property for Reynolds-number, pressure-loss, and fluid-data workflows without mixing density into the wrong place.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-flowMinor Losses In Fittings And ValvesAdd fitting, valve, entrance, and exit losses to a piping model without double-counting them or applying a loss coefficient at the wrong velocity.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 / pipe-flowPipe Roughness And Relative RoughnessSelect and document pipe roughness for Darcy friction-factor calculations without treating a handbook value as a guaranteed surface measurement.fluids / pipe-flowPipe Schedule, Outside Diameter, And Inside DiameterTranslate nominal pipe size and schedule into the actual diameter needed for velocity, Reynolds-number, and pressure-loss calculations.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.statistics / statistical-powerStatistical Power For Engineering TestsPlan an engineering test around the probability of detecting a practically important change instead of relying on significance level alone.