specific gravity – the ratio of the density of any substance to the density of some other substance taken as standard, water being the standard for liquids and solids, and hydrogen or air being the standard for gases
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solishtirma vazn – har qanday moddaning zichligi standart sifatida qabul qilingan boshqa moddalarning zichligiga nisbati, suv suyuqlik va qattiq moddalar uchun standart bo'lib, vodorod yoki havo gazlar uchun standart hisoblanadi.
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