<prompt> In an adult man weighing 70kgs, the extracellular fluid volume will be about42L25L14L12L  <response>: Body water varies from 45-75 of body weight. The intracellular component of body water accounts for about 40 of body weight and the extracellular component constitute 20 of body weight. Hence 20 of 70 equals to 14L approximately. REF TEXTBOOK OF MEDICAL P G N 2 EDITION, PAGE NO 61 