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You could measure differently each time, or the item you are measuring can change.

A little example: My community is at the north shore of a lake which drains into a river which has a dam for power generation on it. If I were to give you a boat, a GPS and a depth finder, and a job going out to the middle of the lake every day and measuring the lake depth, you'd come back with a different measurement every time--because the colder it gets, the more power they need and the faster they let water go through the dam's power house, which causes the level of the lake to drop. Without the GPS, you'd come back with a different measurement because you'd probably go to a slightly different point in the lake every day.

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Q: Why are repeat measurements not all the same?
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