Understanding Gas Pressure and Units

What is the basic definition of pressure in terms of force and area?

• Pressure is the force applied per unit length.

• Pressure is the force applied per unit area.

• Pressure is the force applied per unit mass.

• Pressure is the force applied per unit volume.

What causes the pressure of a gas inside a container?

• The temperature of the gas.

• The weight of the gas particles.

• The collisions of gas particles with the container walls.

• The volume of the container.

Which unit of pressure is derived from the height of mercury in a barometer?

• Millimeter of mercury

• Atmosphere

• Pascal

• Pound per square inch

Who is credited with the invention of the barometer?

• Isaac Newton

• Robert Boyle

• Evangelista Torricelli

• Blaise Pascal

What is the equivalent of one atmosphere in millimeters of mercury?

• 500 mm Hg

• 1,000 mm Hg

• 760 mm Hg

• 101,325 mm Hg

What is the most common unit of pressure used in gas laws?

• Pascal

• Millimeter of mercury

• Torr

• Atmosphere

What is the SI unit for pressure?

• Pascal

• Bar

• Atmosphere

• Torr

How is one Pascal defined in terms of force and area?

• One Newton per square inch

• One Newton per square centimeter

• One Newton per square meter

• One Newton per square millimeter

Why are pressure values often expressed in kilopascals rather than pascals?

• To avoid using large numbers

• To match atmospheric pressure

• To make calculations easier

• To simplify unit conversions

Which of the following is NOT a unit of pressure?

• Inches of mercury

• Pounds per square inch

• Joules per cubic meter

• Millimeters of mercury