Certified Postanesthesia nurse (CPAN) a postanesthesia nurse who has been certified by the American Board of Postanesthesia Nursing Certification. charge nurse a registered nurse responsible for the management of a patient care unit. circulating nurse a nurse member of the surgical team, responsible for activities of the operating room outside the sterile field and for managing nursing care of the surgical patient in the room.
Sea water covers 97% of the earth surface, while fresh water just 3% - an imbalance which makes drinkable water a precious resource. Sea water contains a great amount of salt up to 3.5 %, while fresh water has only a concentration of 0.5% salt. The increased salt level determines a higher density for sea water and a decreased freezing point, while fresh water has a lower density and a normal freezing point.
Q. What is the approximate ratio of fresh to salt water on earth? I would guess that the polar ice caps are a large reservoir of fresh water, but much smaller than the salt water in the oceans. A. The amount of fresh water in ice caps and glaciers adds up to considerably more than a drop in the bucket when compared with the salty ocean, but it is still only a glass of water in the bathtub, according to estimates by Dr. David A. Ross, an oceanographer and a scientist emeritus at the Woods Hole Oceanographic Institution in Massachusetts.