The pressure exerted by a 760 mm column of mercury at 0°C is known as

Question

The pressure exerted by a 760 mm column of mercury at 0°C is known as

1. A. 1 pascal
2. B. 1 atmosphere (Correct answer)
3. C. 1 bar
4. D. 1 poise

Correct Answer

Option B — 1 atmosphere

Detailed Solution & Explanation

The correct answer is 1 atmosphere.

Key Points

• 1 atmosphere (atm) is defined as the pressure exerted by a 760 mm (76 cm) column of mercury at 0°C at sea level (standard gravity).
• This is equivalent to 101,325 Pa (pascals).
• A bar (100,000 Pa) is slightly less than 1 atm.
• Poise is a unit of dynamic viscosity, not pressure.