Final answer:
The pressure within the tank is approximately 12608.83 psi.
Step-by-step explanation:
The pressure within the tank can be converted from bar to psi using the conversion factor that 1 bar is equal to approximately 14.5038 psi.
Therefore, to find the pressure within the tank in psi, we multiply the given pressure in bar by the conversion factor:
Pressure in psi = 870 bar x 14.5038 psi/bar = 12608.83 psi
Therefore, the pressure within the tank is approximately 12608.83 psi.