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কেরোসিনের ঘনত্ব 800 kgm-3 800 kgm-3 কেরোসিনের জায়গা দখল করে 1000 kgm-3 পানি 1 kgm3 " " " " " " "" " " " 1000 ---------------- 800 5 kgm-3 " " " " " " """ 1000×5 ----------------------- 800 = 6.25kg.
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