Pascal The SI unit of pressure equal

Pascal the SI unit of pressure equal to newtons per meter squared. (5.1)... 

Pa) the SI unit of pressure, equal to a force of one newton per square meter. 101325 pascals = 1 atmosphere 10s pascals = 1 bar. 

Partition function (q, z) - For a single molecule, q = Y,.g.exp EjkT), where e, is an energy level of degeneracy the Boltzmann constant, and T the absolute temperature the summation extends over all energy states. For a system of non-interacting molecules which are indistinguishable, as in an ideal gas, the canonical partition function Q = qN/Nl Pascal (Pa) - The SI unit of pressure, equal to N/m. [1]... 

Before we start describing the gas law relationships, we will need to describe the concept of pressure. When we use the word pressure with respect to gases, we may be referring to the pressure of a gas inside a container or we might be referring to atmospheric pressure, the pressure due to the weight of the atmosphere above us. The pressure at sea level is 1 atmosphere (atm). Commonly, the unit torr is used for pressure, where 1 torr = 1 mm Hg (millimeters of mercury), so that atmospheric pressure at sea level equals 760 torr. The SI unit of pressure is the pascal (Pa), so that latm = 760 mm Hg = 760 torr = 1.01325 X 10s Pa (or 101.325 kPa). 

The differences between the units can be ignored when the exact numerical values are not under consideration, unless otherwise we need the nature of activation volumes in order to obtain some aspects of the reaction mechanism, e.g., 1 kbar = 100 MPa = 1000 kg/cm2 = 1000 atm = 7.5 x 105 mmHg. This is indeed the case in high-pressure synthetic chemistry or preparation under pressure. In the Systeme International d Unites (SI units) adopted by the Conference Generale des Poids et Mesures and endorsed by the International Organization for Standardization, the unit of force is the Newton (N), which is equal to kilogram x (meter per second) per second and is written as kgm s 2. The SI unit of pressure is one Newton per square meter (Nm 2) which is called a Pascal (Pa) 1 bar = 105 Pa thus, the Pa is used in this chapter as an approximate equivalent to other units (Table 1). 

Units of pressure The SI unit of pressure is the pascal (Pa). It is named for Blaise Pascal, a French mathematician and philosopher. The pascal is derived from the SI unit of force, the newton (N), which is derived from three SI base units the kilogram, the meter, and the second. One pascal is equal to a force of one newton per square meter 1 Pa = 1 N/m. Many fields of science still use more traditional units of pressure. For example, engineers often report pressure as pounds per square inch (psi). The pressures measured by barometers and manometers can be reported in milhmeters of mercury (mm Hg). There also is a unit called the torr, which is named to honor Torricelli. One torr is equal to one mm Hg. 

Pressure results from a force exerted on an area. The SI unit of force is the newton (N) 1 N = 1 kg m/s. The SI unit of pressure is the pascal (Pa), which equals a force of one newton exerted on an area of one square meter ... 

Pascal the SI unit of measurement for pressure equal to one newton per square meter. 

Pascal pas- kal [Blaise Pascal] (1956) (Pa) n. The SI unit of pressure and stress, equal to 1 Newton per square meter (N/m ). The pascal and its multiples are intended to supersede all other units of force per unit area such as pounds per square inch, atmosphere, torr, etc (Ipsi = 6.894,757 kPa, latm = 101.3250kPa, and Itorr = 133.322Pa). 

The SI unit of pressure is N/m. It is given Ihe name pascal (Pa) after Blaise Pascal (1623-1662), a French malhematician and scientist 1 Pa = 1 N/m. A related unit sometimes used to report pressures is Ihe bar, which equals 10 Pa. Atmospheric pressure at sea level is about 100 kPa or 1 bar. The actual atmospheric pressure at any location depends on wealher conditions and altitude. 

Pressure.—The SI unit of pressure is the newton per square metre, N m-, which by recent international agreement may be called the pascal. Pa. For p, V, T studies the pascal is inconveniratly small, and the most appropriate multiple of the unit would appear, according to SI rules, to be the megapascal, MPa = 10 Pa. However, the MPa is not yet in common use and we shall employ instead the bar, equal to 10 Pa. In SI, the bar has the status of a unit that may be used as an (inferior) alternative to an SI unit and its recommended multiples. The bar is related to some other, now obsolescent, units of pressure as follows ... 

The pascal (Pa) is the SI unit of pressure. One pascal is equal to a force of one newton per square meter. Some scientists use other units of pressure. For example, engineers use pounds per square inch. Barometers and manometers measure pressure in millimeters of mercury (mm Hg). A unit called the torr is equal to 1 mm Hg. 

Here, m is the mass of the substance, c the specific heat and AT the temperature difference. The boiling point of a liquid is the temperature at which the vapor pressure equals the environmental pressure surrounding the liquid. The SI unit of pressure is N/m which is called Pascal, Pa. The standard pressure is the pressure at 1 bar (100 kPa, this is the current lUPAC definition). The standard reference conditions are temperature 0°C, pressure 100 kPa. 

As you learned in previous studies, pressure is defined in physical terms as the force exerted on an object per unit of surface area (P = FI A). One commonly used SI unit of pressure is the pascal (Pa), equal to 1 N/m2. More often, pressure is reported in kilopascals (kPa), equal to 1000 Pa. (You will learn about other units of pressure later in this section.)... 

The SI unit of P is the pascal (Pa). However, millimeters of mercury (also called torr) has continued to remain popular (see Box 27-2 for conversion factors). Use of SI units does have a practical advantage in that 1 atm almost equals 100 kPa (1 atm = 101.325 kPa). Partial pressures expressed in kilopascals are therefore very close estimates of percentages of the gases in the mixture at 1 atm. Pressure, P (or p), may mean either total pressure, as in the expression P(Amb) for the mixture of gases in ambient air, or partial pressure in blood, as in P02(aB). Numerical value and units of R differ depending on the units used for P, so that ... 

Pressure is one of the basic variables in thermodynamics. It is the force exerted by the system on the unit area of its wall. In the SI system, the basic unit of pressure is Pascal (Pa). One Pascal is equal to the force of one Newton exerted on one square meter. 

Pascal - An SI unit of measurement of pressure equal to the pressure resulting from a force of one newton acting uniformly over an area of one square meter. Used to denote the pressure of gases, vapors, or liquids and the strength of solids. Abbreviated Pa. 

Pressure is often quoted in the non-SI units of torr, 1 torr being equivalent to 1 mmHg. The SI unit for pressure is the pascal. Pa. One Pa is equal to one newton per square meter (N/m ). To convert between torr and Pa, simply multiply the pressure in torr by 133.3 to obtain the pressure in Pa (750 torr = 10 Pa). 

---