To convert the pressure from kilopascals (kPa) to atmospheres (atm), we can use the conversion factor that 1 atm is approximately equal to 101.325 kPa.
We start with the given pressure:
Pressure = 543 kPa
Now, we apply the conversion:
Pressure in atm = Pressure in kPa / Conversion factor
Pressure in atm = 543 kPa / 101.325 kPa/atm ≈ 5.36 atm
Therefore, the pressure 450 meters underwater, which is 543 kPa, is approximately 5.36 atm.