Question

What is one atmosphere?

Answer 1

One atmosphere:

1. One atmosphere ($101.325\hspace{0.17em}\text{kPa}$ or $14.7\hspace{0.17em}\text{psi}$) is also the pressure caused by the weight of a $10.3\text{m}$ column of freshwater ($33.8\text{ft}$).
2. As a result, a diver $10.3\hspace{0.17em}\text{m}$ underwater experiences a pressure of approximately 2 atmospheres ($1\hspace{0.17em}\text{atm}$ of air plus $1\hspace{0.17em}\text{atm}$ of water).