Sentence:  As for the night being warm , he would have been comfortable naked on Mount Everest but his water brothers had little tolerance for changes in temperature and <WSD>pressure</WSD> ; he was considerate of their weakness , once he learned of it . 
Meaning of the word marked with <WSD> tags:  the force applied to a unit area of surface; measured in pascals (SI unit) or in dynes (cgs unit)