Key Concepts: Pressure & Standard Atmosphere

Core Definitions

• Pressure: Force per unit area exerted by gas particles colliding with container walls.
• Standard Atmosphere (atm): 1 atm = 101.325 kPa = 760 mmHg = 760 torr.
• Pascal (Pa): The SI unit of pressure; 1 kPa = 1000 Pa.
• Barometer: An instrument that measures atmospheric pressure.
• Manometer: An instrument that measures the pressure of a gas in a container.
• STP: Standard Temperature and Pressure: 0°C (273 K) and 1 atm.