* Atmosphere: The atmosphere is the layer of gas that surrounds the Earth. The weight of this air exerts pressure on everything below it, including us.
* Standard Atmosphere: A "standard atmosphere" (1 atm) is defined as the average air pressure at sea level.
* Pressure Measurement: 1 atm is equivalent to:
* 101.325 kilopascals (kPa)
* 760 millimeters of mercury (mmHg)
* 14.696 pounds per square inch (psi)
Why is it used?
* Convenience: It's a convenient unit because it relates directly to the pressure we experience in our daily lives.
* Comparison: It provides a standard reference point for comparing gas pressures.
* Scientific Use: In chemistry, physics, and meteorology, atmospheres are commonly used to describe the pressure of gases.
Example:
A tire inflated to 32 psi is about 2.2 atmospheres of pressure.
