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What is a unit? A practical guide
Why every measurement needs a unit, the difference between base and derived units, and why SI exists.
6 min DataWhy KB and KiB are different — and why it matters
Disk drives advertise GB, but your OS reports GiB. This article explains the 1000-vs-1024 divide.
5 min LengthMetric vs Imperial: which countries still use imperial?
A quick map of who uses which — and where metric beats imperial at scale.
4 min TemperatureCelsius to Fahrenheit explained — the formula and the intuition
F = C × 9/5 + 32. Here is why that formula is what it is.
4 min SpeedWhat is a knot, and where did it come from?
A nautical mile per hour, measured by counting knots in a rope.
3 min TimeWhy 29 days in February? The Roman calendar mess
From Numa to Caesar to the Gregorian reform — and why this means "year to day" conversions have caveats.
4 min PressureHow pressure measurement evolved — from Torricelli to psi
Why psi and kPa and bar are all 1 atm apart by design.
5 min EnergyJoule vs calorie vs kWh — which energy unit wins?
Why your electric bill uses kWh, your food label uses kcal, and your physics class uses joules.
5 min AngleRadians, degrees, and gradians — when to use which
Why radians are the only honest angle for math, and why gradians exist for surveyors.
4 min Fuel EconomyHow MPG converts to L/100 km — and why the math is reciprocal
Fuel economy is the one quantity where "higher is better" turns into "lower is better" depending on unit.
4 min ReferenceSquare vs cubic units — and why you can't directly convert
Square metres to square feet is a factor. Square metres to cubic metres is nonsense.
3 min ReferenceWhy we need SI — and what it would cost to abolish it
A short history of measurement, the French Revolution, and the modern standards regime.
5 min TimeSecond, minute, hour, day — clean conversions and 1 tricky case
Everything in the time category converts trivially except month-year boundaries.
3 min