Tuesday, January 15, 2013

Tekanan Hidrostatis – Pengertian, Rumus

Tekanan di dalam fluida yang diakibatkan oleh gaya gravitasi disebut tekanan hidrostatis.

Tekanan Hidrostatis

Gambar 7.1 melukiskan suatu zat cair setinggi h dengan massa jenis ρ berada dalam wadah berbentuk silinder dengan luas penampang A. Tekanan yang diterima oleh dasar wadah disebabkan gaya gravitasi yang bekerja pada tiap bagian zat cair, yaitu berupa berat zat cair yang berada di atas dasar wadah.

Berdasar konsep tekanan maka tekanan hidrostatis Ph yang bekerja pada dasar wadah dinyatakan dengan:

Rumus tekanan hidrostatis ph yang bekerja pada dasar wadah 
menyatakan berat zat cair di atas dasar wadah (F = W = ρ . V . g)

Rumus Tekanan hidrostatis
Penjelasan lambang dari rumus tekanan hidrostatis

Dari persamaan Ph = ρ . g . h didapat bahwa besar tekanan hidrostatis itu bergantung pada kedalaman zat cair. Berdasar hukum pokok hidrostatis menyatakan "semua titik yang terletak pada suatu bidang datar di dalam suatu zat cair memiliki tekanan yang sama".

Gambar Hukum Poko hidrostatis

Dari gambar 7.2, karena titik A dan titik B terletak pada dasar bejana yang berisi zat cair dengan massa jenis ρ dan ketinggian permukaan dari dasar bejana = h1, maka tekanan di titik A sama dengan tekanan di titik B. PA = PB = ρ . g . h1 → h1 = ketinggian permukaan zat cair dalam bejana


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