Torr A unit of pressure equal

Millimeters of mercury (mmHg) a unit of pressure also known as the torr. A unit of pressure equal to that exerted by a column of mercury 1 mm high at 0.00°C. (5.1)... 

TMA Toy Mfgrs. of America torr A unit of pressure equal to l/760th of an atmosphere [mm mercury (mm Hg)]... 

STP Standard conditions of exactly 0 C (273 K) temperature and 1 atm pressure used for the comparison of gases, torr A unit of pressure equal to 1 mmHg 760 torr = 1 atm. vapor pressure The pressure exerted by the particles of vapor above a hquid. 

Atmospheric pressure can be expressed a number of different ways. It can be expressed in millimeters of mercury (mm Hg) atmospheres (atm), a unit of pressure where 1 atmosphere is the pressure at sea level torr, a unit of pressure where 1 torr equ s 1 millimeter of mercury pounds per square inch (psi) pascals (Pa), a unit of pressure where 1 pascal equ ds 1 newton per square meter (don t worry about what a newton is just trust me that this stuff is a way to express pressure) or kilopascals (Wa), where 1 kilopascal equals 1,000 pascsds. 

A torr is a unit of pressure equal to the unit millimeter of mercury. 

Torr - A non-SI unit of pressure, equal to 133.322 Pa. The name is generally considered interchangeable with mUlimeter of mercury. 

Torr t6r [Evangelista Torricelli] (1949) n.A unit of pressure 1 torr = 1 mmHg = atm. The torr (for E. Torricelh, who invented the mercury barometer in 1643) was introduced a few decades ago when people grew weary of saying milhmeters of mercury , to which it was set equal. Now the torr, too, is depreciated. 

Torr Unit of pressure equal to one part in 760 of a standard atmosphere, also equal to the pressure at the bottom of a column of mercury 1 millimeter high with vacuum above it. 

Some non-SI units continue to be used, such as the atmosphere (atm), which is a unit of pressure defined to equal exactly 101,325 N m (101,325 Pa), the bar (bar), defined to equal exactly 100,000 N m (100,000 Pa), the torr (Torr), defined such that exactly 760 Torr equals exactly 1 atm, and the liter (1), which is a unit of volume exactly equal to 0.001. The Celsius temperature scale is... 

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 pascal represents a very small pressure, and therefore the most common applications, such as tire pressure, will use kilopascals (kPa) instead of Pa. Other units of pressure include the torr (or millimeter of mercury, mmHg), inches of mercury, the atmosphere (atm), and the bar. A torr is an amount of pressure necessary to support a column of mercury 1 mm in height. One atmosphere of pressure is loosely defined by the atmospheric pressure at sea level, but is more precisely defined as the pressure necessary to support a column of mercury 760 mm in height. One bar of pressure is equal to 100 kPa. The relationships between the various units of pressure are given below ... 

Volume may be expressed in a variety of units—liter (L), milliliter (mL), cubic meter (m3), cubic centimeter (cc or cm3). Similarly, pressure can be expressed in a variety of units, but the standard unit of pressure is the atmosphere (atm) one atmosphere (1 atm) is defined as the pressure needed to support a column of mercury 760 mm in height at 0°C at sea level. In honor of Evangelista Torricelli, the Italian inventor of the barometer, the unit torr is used and is equal to 1 mm Hg. Thus... 

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. 

At sea level, the average air pressure is 760 mm Hg when the temperature is 0°C. Air pressure often is reported in a unit called an atmosphere (atm). One atmosphere is equal to 760 mm Hg or 760 torr or 101.3 kilopascals (kPa). Table 13-1 compares different units of pressure. Because the units 1 atm, 760 mm Hg, and 760 torr are defined units, they have as many significant figures as needed when used in calculations. Do the problem-solving LAB to see how the combined pressure of air and water affects divers. 

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