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Sabun termasuk salah satu jenis surfaktan yang terbuat dari minyak atau lemak alami. Surfaktan mempunyai struktur bipolar, bagian kepala bersifat hidrofilik dan bagian ekor bersifat hidrofobik. Karena sifat inilah sabun mampu mengangkat kotoran (biasanya lemak) dari badan atau pakaian. Sabun adalah benda wajib yang kita pakai setiap hari. Tanpa sabun, mandi terasa tidak bersih karena sabun berfungsi untuk mengangkat kotoran yang menempel di tubuh kita.
Abundant river is one of Indonesia's natural potential that can be developed. Therefore, further research is needed to utilize the river as power plants, in this case is a micro-hydro power plant type of vertical axis turbines. Experimental studies carried out with several variations on the blade, pitch angle and the amount of water at a flow rate between 0,7 to 1,0 m/s. Darieus, type of vertical axis turbine using NACA 0018 airfoils with specifications 0,8 m length of spand and 0,1 m chord for 0,4 m diameter has a higher rotational speed in the 3-blade compared to the 4-blade using passive variable pitch. Lower rotational speed and torque due to the addition of a turbine blade and the amount of drag force (Fx) is greater without the addition of the lift force (Fy).
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