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.
If the amount of fresh water is constant on Earth then why do we need to conserve it? What is the percentage of fresh water on the Earth? Why does on the earth only 3% fresh water and rest 97% about sea water? Why Earth contains so much saline water than fresh water? Is the total amount of water on Earth always constant?