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Hidrostatični tlak

Hídrostátični tlák je tlak v mirujoči tekočini zaradi njene lastne teže. V nestisljivih kapljevinah narašča tlak p premo sorazmerno z globino h:

Pri tem je zračni tlak, ρ gostota kapljevine, g pa težni pospešek. Izraz za hidrostatični tlak je ponekod znan kot Pascalov zakon.

Uporaba

[uredi | uredi kodo]
  • Ker se lahko vodo v približku obravnava kot nestisljivo tekočino, gornji izraz razmeroma dobro opisuje naraščanje tlaka z vodno globino, in jo uporabljajo potapljači.
  • Zraka, po drugi strani, ni moč obravnavati kot nestisljivo tekočino. Eksponentno pojemanje tlaka z višino v izotermni atmosferi opisuje barometrska enačba.
  • Navidez protislovno dejstvo, da je hidrostatični tlak odvisen le od višine stolpca kapljevine, ne pa od oblike posode, je znano kot hidrostatični paradoks.
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Hidrostatični tlak
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