Uncertainty in measurements.

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[00:00:00]Every measurement you've ever made in physics is wrong. But here's the thing, that's not a mistake. [music] Uncertainty is built into the process because no instrument is perfect. So, when [music] we say absolute uncertainty, we're talking about the actual margin of error. If your ruler measures to the nearest millimeter, your uncertainty is plus or minus 0.5 mm.

[00:00:24]That number isn't optional, it's part of [music] the measurement itself.