The method of body composition assessment that measures body volume similar to underwater weighing,but in the air (as opposed to underwater)is

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Air displacement plethysmography is the method that measures body volume similar to underwater weighing, but in the air. BIA measures the resistance of body tissues to a small electrical current and is less accurate than air displacement plethysmography for assessing body fat percentage. DEXA uses X-ray technology to measure bone density and can also assess body composition, but it is not specifically designed to measure body volume. Ultrasound is useful for measuring subcutaneous fat thickness but cannot assess overall body volume.

The Method of Body Composition Assessment That Measures Body Volume