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  2. Air changes per hour - Wikipedia

    en.wikipedia.org/wiki/Air_changes_per_hour

    Air changes are often cited as a means of preventing condensation in houses with forced ventilation systems often rated 3–5 ACH though without referencing the size of the house. However, where ACH is already greater than 0.75 a forced ventilation system is unlikely to be of use at controlling condensation and instead insulation or heating are ...

  3. Air cooling - Wikipedia

    en.wikipedia.org/wiki/Air_cooling

    A rule-of-thumb formula to note: 1 – (h/17500) = derating factor. Where h is the height over sea level in meters. And the result is the factor that should be multiplied with the cooling capacity in [W] to get the cooling capacity at the specified height over sea level. [1]

  4. Rule of thumb - Wikipedia

    en.wikipedia.org/wiki/Rule_of_thumb

    Cartoon by James Gillray satirizing Sir Francis Buller, 1782: "Judge Thumb; or, Patent Sticks for Family Correction: Warranted Lawful!". A modern folk etymology [15] relates the phrase to domestic violence via an alleged rule under English common law which permitted wife-beating provided that the implement used was a rod or stick no thicker than a man's thumb. [7]

  5. Axial compressor - Wikipedia

    en.wikipedia.org/wiki/Axial_compressor

    Axial flow compressors produce a continuous flow of compressed gas, and have the benefits of high efficiency and large mass flow rate, particularly in relation to their size and cross-section. They do, however, require several rows of airfoils to achieve a large pressure rise, making them complex and expensive relative to other designs (e.g ...

  6. Cohen's h - Wikipedia

    en.wikipedia.org/wiki/Cohen's_h

    Researchers have used Cohen's h as follows.. Describe the differences in proportions using the rule of thumb criteria set out by Cohen. [1] Namely, h = 0.2 is a "small" difference, h = 0.5 is a "medium" difference, and h = 0.8 is a "large" difference.

  7. Can you afford to retire at this exact moment? Here are 3 ...

    www.aol.com/finance/afford-retire-exact-moment-3...

    Here are 3 simple rules of thumb to figure out if you can make the move in 2025. Moneywise. February 9, 2025 at 6:48 AM. Can you afford to retire at this exact moment? Here are 3 simple rules of ...

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