* Pressure: Pressure is a force applied over a specific area. In the context of gases, it's the force exerted by the gas molecules colliding with the walls of their container.
* cm Hg: This abbreviation stands for "centimeters of mercury". It's a unit of pressure measurement based on the height of a column of mercury in a barometer.
* Barometer: A barometer is a device used to measure atmospheric pressure. It works by balancing the pressure of the atmosphere against the weight of a column of mercury.
Therefore, 13.6 cm Hg indicates that the pressure of the gas is equivalent to the pressure exerted by the weight of a 13.6 cm tall column of mercury.
Here's a further explanation:
* Mercury is a dense liquid, and its weight creates a pressure at the bottom of the column.
* In a barometer, the height of the mercury column changes with atmospheric pressure.
* If the pressure of the gas is the same as the pressure exerted by the 13.6 cm column of mercury, it means that the gas is capable of pushing down on a surface with the same force as the weight of that mercury column.
Important Note: 13.6 cm Hg is a relatively low pressure. Standard atmospheric pressure at sea level is approximately 76 cm Hg.
