Scan_Doc0091 - verting from torrs or atmospheres to pascals...

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Figure 5.3 A simple manometer, a device for measur- ing the pressure of a gas in a container. The pressure of the gas is given by h (the difference in mercury levels) in units of torr (equivalent to mm Hg). (a) Gas pressure = atmospheric pressure - h. (b) Gas pressure = atmospheric pressure + h. Checking tire pressure. EXAMPLE 5.1 1 atm = 760 mm Hg = 760 torr = 101,325 Pa = 29.92 in Hg = 14.7 Ib/in 2 5.2 The Gas Laws of Boule, Charles, and Avogadro 183 Atmospheric pressure (I~lIm) Atmospheric pressure (P,lIm) (a) (b) is newtons per meter squared (N/m2) and is called the pascal (Pa). In terms of pascals, the standard atmosphere is 1 standard atmosphere = 101,325 Pa Thus 1 atmosphere is about 10 5 pascals. Since the pascal is so small, and since it is not commonly used in the United States, we will use it sparingly in this book. However, con-
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Unformatted text preview: verting from torrs or atmospheres to pascals is straightforward, as shown in Example 5.1. The pressure of a gas is measured as 49 torr. Represent this pressure in both atmospheres and pascals. Solution 6.4 x 1 atm 1 49 torr x = 6.4 x 10-- atm 760 terf 101,325 Pa 10-2 aan X = 6.5 X 10 3 Pa 1 atm SEE EXERCISES 5.35 AND 5.36 5.2 The Gas Laws of BoyLe, CharLes, and Avogadro In this section we will consider several mathematical laws that relate the properties of gases. These laws derive from experiments involving careful measurements of the rele-vant gas properties. From these experimental results, the mathematical relationships among...
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