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Human estimation of quantities is usually pretty unreliable. There is an entity known by the psychologists as JND or just noticeable difference. This is approx 25%.
If we are asked to match say two masses just using our sense of feel, then an agreement within 25% is to be expected. Similarly with heat and the brightness of a light.
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∙ 10y ago
Anonymous
count is the least accurate unit of measure
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What is the use of pulse generator echo sounder?
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