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.
It is unexpected and somewhat inconceivable that less than three percent of Earth's water is fresh water. According to the U.S. Geological Survey, most of that three percent is inaccessible. Over 68 percent of the fresh water on Earth is found in icecaps and glaciers, and just over 30 percent is found in ground water. Only about 0.3 percent of our fresh water is found in the surface water of lakes, rivers, and swamps. Of all the water on Earth, more than 99 percent of Earth's water is unusable by humans and many other living things!