CHEM 24112 Lecture Notes - Lecture 33: Neon Sign, Torr, Barometer

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CHEMISTRY 112 – DAY 33 Chapter 13: Sections 1-2

4/11/18

PRESSURE and BOYLE’S LAW

Pressure

SI units = Newton/meter2 = 1 Pascal (Pa)

1 standard atmosphere = 101,325 Pa

1 standard atmosphere = 1 atm = 760 mm Hg = 760 torr

How is pressure measured?

Barometer: Device used to measure atmospheric pressure.

Manometer: Device used for measuring the pressure of a gas in a container.

Pressure Conversions

EXAMPLE 1: The pressure of the air in a tire is measured to be 28 psi. Represent this pressure in atmospheres,

torr, and pascals.

EXAMPLE 2: The height of mercury in a mercury barometer is measured to be 732 mm Hg. Represent this

pressure in atm, torr, and pascals.

EXAMPLE 3: The pressure of a gas is measured to be 2.79 x 105 Pa. Represent this pressure in atm, torr, and

psi.

EXAMPLE 4: On a summer day in Breckenridge, Colorado, the atmospheric pressure is 525 mm Hg. What is

this air pressure in atmospheres?

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Document Summary

Si units = newton/meter2 = 1 pascal (pa) 1 standard atmosphere = 1 atm = 760 mm hg = 760 torr. Manometer: device used for measuring the pressure of a gas in a container. Example 1: the pressure of the air in a tire is measured to be 28 psi. Represent this pressure in atmospheres, torr, and pascals. Example 2: the height of mercury in a mercury barometer is measured to be 732 mm hg. Represent this pressure in atm, torr, and pascals. Example 3: the pressure of a gas is measured to be 2. 79 x 105 pa. Represent this pressure in atm, torr, and psi. Example 4: on a summer day in breckenridge, colorado, the atmospheric pressure is 525 mm hg. Pressure and volume are inversely related (constant t, temperature, and n, # of moles of gas). Pv = k (k is a constant for a given sample of air at a specific temperature)

Related Questions

Converting between Units of Pressure Gases are different from solids and liquids. In a sample of gas, the molecules are far apart. The gas molecules also move around and collide with each other as well as with the walls of the container. These collisions generate pressure. The pressure of a gas can be measured in different units. One convenient unit of measure is called the atmosphere (atm) because it is based on atmospheric pressure. At sea level, the average pressure is 1 atm. As you get higher in altitude, the pressure steadily drops until you leave the atmosphere, where the pressure is very close to 0 atm. The table below shows the different commonly used units of measuring gas pressure. Use this table in the pressure unit conversions. Unit Abbreviation 1 atm equivalent atmosphere atm 1.00 atm (exact) millimeters of mercury mmHg 760 mmHg torr torr 760 torr inches of mercury in.Hg 29.9 in.Hg pounds per square inch (psi) lb/in.2 14.7 lb/in.2 pascal Pa 101,325 Pa.

Part C

High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this procedure range from around 500 kilopascals (500,000 Pa) to about 60,000 kPa (60,000,000 Pa). It is often convenient to know the pressure in torr. If an HPLC procedure is running at a pressure of 5.81Ã10⁸ Pa , what is its running pressure in torr?

Express the pressure numerically in torr.

To understand several methods of measuring gas pressure. Gases exert a measurable pressure (P) on the walls of their container. The SI unit for pressure is the pascal (Pa). Other pressure units frequently used in chemistry are millimeters of mercury (mmHg) and atmospheres (atm). You can convert between units of pressure using conversion factors such as those indicated below. 1 atm=760 mmHg=101,325 Pa

Part A

On a rainy day, a barometer reads 737 mmHg . Convert this value to atmospheres.

Express your answer numerically in atmospheres

Part B

A closed container is filled with oxygen. The pressure in the container is 445 kPa . What is the pressure in millimeters of mercury?

Express the pressure numerically in millimeters of mercury.

Part C

What is the pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer as shown in the picture? (Figure 1) The atmospheric pressure is 0.95 atm.

Express your answer numerically in atmospheres.

CHEM 24112 Lecture Notes - Lecture 33: Neon Sign, Torr, Barometer

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