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ATM is the abbreviation for atmosphere's, which is a measurement of pressure.

1 ATM = 14.696 PSI

30 ATM = 440.88 PSI

(440.88 pounds)/1 square inch = (40.88 pounds)/(1/144)square feet

63486.72 pounds per square foot.

So 30 atmospheres is equal approximately to 63486.72 pounds per square foot.

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