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Otok-otok is a typical Indonesian toy in the form of a boat made of zinc or cans. The workings of this otok-tok ship use the principle of water vapor pressure which has been heated by a small fire installed in the ship. The difference in temperature due to heating earlier in the ship's pipe causes water to enter and exit from the exhaust as a driving force for the toy.
Actually I want to upload a simulated animation on the smoke, but I don't know how :(
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