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effective area

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effective area [ə¦fek·tiv ′er·ē·ə]
(chemical engineering)
Absolute or cross-sectional area of process media involved in the process, such as the actual area of filter media through which a fluid passes, or the available surface area of absorbent contacted by a gas or liquid.
(electromagnetism)
Of an antenna in any specified direction, the square of the wavelength multiplied by the power gain (or directive gain) in that direction and divided by 4π (12.57).

effective area
The net area of an air outlet or air inlet through which air can pass; it is equal to the free area of the device times the coefficient of discharge.


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Doctors either place a band around the stomach or a make a bypass between a portion of the stomach to the small intestine to reduce the effective area of the stomach.
The effective area in which a camera will work properly is referred as range.
If you use EP capsules to reduce the effects of the menopause, and also suffer from any of these conditions, try opening a capsule and rubbing it on one of the effective areas and then monitor it.
 
 
 
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