With all other variables being held constant, decreasing the wall thickness of a spherical pressure vessel will increase the axial stress.
It should be noted the axial stress simply means the amount of force per unit if the cross sectional area which acts as the lengthwise direction if the beam or axle.
Therefore, based on the information, with all other variables being held constant, decreasing the wall thickness of a spherical pressure vessel will increase the axial stress.
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