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law of conservation of mass – the principle that in any closed system subjected to no external forces, the mass is constant irrespective of its changes in form; the principle that matter cannot be created or destroyed.
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massaning saqlanish qonuni – har qanday yopiq tizimda tashqi kuchlarga tobe bo'lmagan tamoyil, uning o'zgarishidan qat'i nazar, massa doimiyligini ta'minlaydi; moddani yaratish yoki yo'q qilish printsipi.
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