TY - CHAP M1 - Book, Section TI - Mechanics A1 - Freeman, Brian S. A2 - Freeman, Brian S. A2 - Berger, Jeffrey S. Y1 - 2014 N1 - T2 - Anesthesiology Core Review: Part One Basic Exam AB - By definition, pressure (P) is the force (F) applied to an object per unit of area (A), such that P = F/A. The SI unit of pressure is the pascal (Pa); 1 Pa equals 1 newton of force distributed over an area of 1 m2. Pressure can also be defined by other units, such as millimeters of mercury (mm Hg), centimeters of water (cm H2O), pounds per square inch (psi), or atmospheres (atm). These different units are based on the specific way of taking the measurement. For instance, “mm Hg” is the pressure exerted at the base of a 1-mm high column of mercury, whereas “cm H2O” is the pressure exerted at the base of a 1-cm high column of water at 4°C. To convert among the units, it is useful to start with the pressure of the atmosphere at sea level: 1 atm = 760 mm Hg = 988 cm H2O = 14.7 psi. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - accessanesthesiology.mhmedical.com/content.aspx?aid=1102565785 ER -