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Chapter 5: Problem 3

Define pressure and give the common units for pressure.

Short Answer

Expert verified
Pressure is the force exerted per unit area. The common units for pressure include: pascal (Pa), bar, atmospheres (atm), kilopascal (kPa), and millimeters of mercury (mmHg or torr).

Step by step solution

01

Defining Pressure

Pressure can be defined as the physical force exerted on an object. It is the amount of force applied per unit area. This quantity is commonly used in the fields of science and engineering.
02

Identifying units for pressure

There are several units used to measure pressure. Some of the most common ones include\: the pascal (Pa), which is the standard unit of pressure in the International System of Units (SI). Other common units include atmospheres (atm), bar, kilopascal (kPa), and millimeters of mercury (mmHg or torr).

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Most popular questions from this chapter

A barometer having a cross-sectional area of \(1.00 \mathrm{~cm}^{2}\) at sea level measures a pressure of \(76.0 \mathrm{~cm}\) of mercury. The pressure exerted by this column of mercury is equal to the pressure exerted by all the air on \(1 \mathrm{~cm}^{2}\) of Earth's surface. Given that the density of mercury is \(13.6 \mathrm{~g} / \mathrm{mL},\) and the average radius of Earth is \(6371 \mathrm{~km}\), calculate the total mass of Earth's atmosphere in kilograms.

The volume of a gas is \(5.80 \mathrm{~L}\), measured at 1.00 atm. What is the pressure of the gas in \(\mathrm{mmHg}\) if the volume is changed to \(9.65 \mathrm{~L} ?\) (The temperature remains constant.)

A gas at \(772 \mathrm{mmHg}\) and \(35.0^{\circ} \mathrm{C}\) occupies a volume of \(6.85 \mathrm{~L}\). Calculate its volume at STP.

Why is the density of a gas much lower than that of a liquid or solid under atmospheric conditions? What units are normally used to express the density of gases?

Calculate the mass in grams of hydrogen chloride produced when \(5.6 \mathrm{~L}\) of molecular hydrogen measured at STP react with an excess of molecular chlorine gas.
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