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Enter two measurements with their uncertainties and pick an operation to see the propagated uncertainty in the result - the calculation behind every lab report's error-analysis section.
Updates live as you typeEnter your measurements to see the result.
Lab report material is exactly the kind of dense, formula-heavy content spaced repetition was built for - Encodr resurfaces it before the next problem set, not the night before.
Get started freeFor addition or subtraction, absolute uncertainties add in quadrature:
δz = √(δx² + δy²). For multiplication or division,
relative uncertainties add in quadrature instead:
δz/z = √((δx/x)² + (δy/y)²), then that relative
uncertainty is scaled back up by the result to get an absolute uncertainty again. Both formulas
assume the uncertainties in x and y are independent and random, which is the standard assumption
for a single-trial measurement uncertainty (not a full statistical treatment of repeated trials,
which uses standard error instead). This is the same method behind the propagated-uncertainty
section of a typical physics or chemistry lab report.
The two formulas behind every error-analysis section: one for addition and subtraction, one for multiplication and division.
Why engineering courses keep both unit systems alive, and the conversions that actually come up in coursework.
Spaced repetition and retrieval practice were tested on word lists and vocabulary, not just MCAT content - what carries over to engineering, business, and art courses.
Log your practice tests - score, breakdown, conditions, date - and get a weighted prediction of your real MCAT score.
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Open tool →A free, no-signup Pomodoro timer with customizable work and break lengths and a running count of completed sessions.
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