Gas Pressure Conversions

Which of the following is a common unit for measuring gas pressure?

• Millimeters of mercury

• Centimeters

• Yards

• Pounds

The unit "torr" is equivalent to which other gas pressure unit?

• Atmospheres

• Kilopascals

• Millimeters of mercury

• Pounds per square inch

The gas pressure unit "kilopascal" is named after which scientist?

• Torricelli

• Boyle

• Pascal

• Avogadro

What is the approximate pressure in kilopascals (kPa) that is equivalent to 1 atmosphere (atm)?

• 760 kPa

• 101.3 kPa

• 1 kPa

• 225 kPa

When converting 225 kPa to atmospheres using the conversion factor 1 atm / 101.3 kPa, why is the final answer rounded to 2.22 atm?

• The number 1 in 1 atm has one significant figure.

• The value 101.3 kPa has four significant figures.

• The initial pressure of 225 kPa has three significant figures.

• The conversion factor is a definition and does not affect significant figures.

What is the pressure of 225 kPa expressed in atmospheres (atm)? (Given: 1 atm = 101.3 kPa)

• 2.22 atm

• 2.221 atm

• 0.450 atm

• 0.4504 atm

When performing unit conversions, what is the primary rule for selecting the correct orientation of a conversion factor (e.g., A/B vs. B/A)?

• The unit you want to convert to should be in the numerator.

• The unit you are converting from should be in the denominator.

• The larger numerical value should always be in the numerator.

• The conversion factor with fewer significant figures should be chosen.

A car tire has a pressure of 225 kPa. What is this pressure in millimeters of mercury (mmHg)? (Given: 760 mmHg = 101.3 kPa)

• 1689 mmHg

• 1690 mmHg

• 1700 mmHg

• 170 mmHg