What is the pressure in a fully charged self-contained breathing apparatus?

The pressure in a fully charged self-contained breathing apparatus (SCBA) is typically around 31 MPa, which is equivalent to 310 bar or about 4500 psi. This pressure ensures that the apparatus has a sufficient supply of breathable air for the user to operate safely in hazardous environments, such as during firefighting or rescue operations. Understanding this specific pressure is crucial for safety and operational readiness, as it impacts the duration of air supply and the effectiveness of the SCBA in emergency situations. The other options suggest pressures that exceed typical standards for SCBA devices used in most industries.