How much does the air pressure decrease when climbing to the tenth floor (about 30 m)?

How much does the air pressure decrease when climbing to the tenth floor (about 30 m)? What fraction of the normal atmospheric pressure is this pressure change?

For every 12m of lift, the pressure decreases by 1mm. rt. Art. or at 133, ZPa.
30:12 = 2.5mm \ Hg – pressure change, 2.5 * 133, ZPa = 333.25Pa; 101300Pa – 100%, 333.35Pa – x%, x = 0.3%.
Answer: the pressure decreased by 333 Pa, which is 0.3%

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