Question

The vacuum in a closed container is 50 mm of Hg The absolute pressure in the container is

• A. 0.92 bar
• B. 0.90 bar
• C. 0.95 bar
• D. 0.82 bar

Hint:

Remember that absolute pressure is the atmospheric pressure minus the vacuum pressure and convert the vacuum pressure from mm of Hg to bar

Answer 1

The Correct Option is A

The atmospheric pressure is \( 1 \, \text{bar} \), and the vacuum pressure is \( 50 \, \text{mm of Hg} \). The absolute pressure is calculated as:

Absolute pressure = Atmospheric pressure – Vacuum pressure

\( = 1 \, \text{bar} - \frac{50 \, \text{mm of Hg}}{760 \, \text{mm of Hg}} \times 1 \, \text{bar} = 0.92 \, \text{bar}. \)