Poise

Poise (simbol P, /ˈpɔɪz/) adalah satuan viskositas dinamis dalam sistem satuan sentimeter–gram–sekon.^[1] Satuan ini dinamai dari Jean Léonard Marie Poiseuille.

Definisi

Simulasi cairan dengan viskositas berbeda. Cairan di sebelah kiri memiliki viskositas lebih rendah daripada cairan di sebelah kanan.

Jika suatu fluida ditempatkan antara dua pelat dengan jarak satu sentimeter, dan satu pelat didorong ke samping dengan tegangan geser 1 pascal, dan bergerak ke arah $x$ sentimeter per sekon, maka viskositasnya adalah $1 10x$ pascal sekon atau 1 poise.

1~{\text{P}}=0.100~{\text{kg}}\cdot {\text{m}}^{-1}\cdot {\text{s}}^{-1}=1~{\text{g}}\cdot {\text{cm}}^{-1}\cdot {\text{s}}^{-1}.

Satuan analognya dalam Sistem Satuan Internasional adalah pascal-sekon (Pa·s):

1~{\text{Pa}}\cdot {\text{s}}=1~{\text{kg}}\cdot {\text{m}}^{-1}\cdot {\text{s}}^{-1}=10~{\text{P}}.

Poise terkadang digunakan dengan prefiks metrik senti- karena viskositas air pada suhu 20 °C hampir tepat 1 sentipoise. Satu sentipoise merupakan satu per seratus poise, sama dengan satu milipascal-sekon (mPa·s) dalam satuan SI (1 cP = 10⁻³ Pa·s = 1 mPa·s).

Simbol CGS untuk sentipoise adalah cP. Singkatan cps, cp, dan cPs terkadang digunakan.

Air memiliki viskositas 0.00899 poise pada suhu 25 °C dan tekanan 1 atm (0.00899 P = 0.899cP = 0.899 mPa·s).^[2] Dalam satuan SI, air pada suhu 20 °C memiliki viskositas 1.002 mPa·s, sementara minyak motor dapat memiliki viskositas sekitar 250 mPa·s.^[3]

Lihat pula

Lihat entri poise di kamus bebas Wiktionary.

Viskositas

Referensi

^ Gooch, Jan W. (2010). Encyclopedia dictionary of polymers (edisi ke-2nd). Berlin: Springer. ISBN 978-1-4419-6246-1.
^ "Viscosity of Liquids", in CRC Handbook of Chemistry and Physics, 89th Edition (Internet Version 2009), David R. Lide, ed., CRC Press/Taylor and Francis, Boca Raton, FL.
^ Serway, Raymond A. (1996). Physics for Scientists & Engineers (edisi ke-4th). Saunders College Publishing. ISBN 0-03-005932-1.

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