Another unit for pressure is bar. Convert 1 atm and 1 mmHg to bar.

• A. 1 atm = 1.013 bar
  1 mmHg = 1.333×10⁻³ bar
• B. 1 bar = 1.013 atm
  1 bar = 1.333×10⁻³ mmHg
• C. 1 atm = 1.333×10⁻³ bar
  1 mmHg = 1.013 bar
• D. 1 atm = 750 bar
  1 mmHg = 0.987 bar

Answer: (A)