Which one of the following is the largest value of pressure?

• A. 1 atm
• B. 760 mmHg
• C. 1 bar
• D. 101.3 kPa

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the units of pressure given: atm (atmosphere), mmHg (millimeters of mercury), bar, and kPa (kilopascal). Each unit measures pressure but on different scales.
2. Step 2: Recall the standard conversion factors between these units: 1 atm = 760 mmHg = 101.3 kPa ≈ 1.013 bar.
3. Step 3: Convert all pressures to a common unit to compare them easily. For example, convert atm, mmHg, and kPa to bar using the relationships: 1 atm ≈ 1.013 bar, 760 mmHg = 1 atm ≈ 1.013 bar, and 101.3 kPa = 1 atm ≈ 1.013 bar.
4. Step 4: Compare the converted values to see which is the largest. Since 1 bar is slightly less than 1 atm (1 bar = 100 kPa), check if the given 1 bar is exactly 1 bar or if it is being compared to the others.
5. Step 5: Conclude which pressure value is the largest based on the conversions and comparisons made in the previous steps.