هو موضوع صغير عن الماده النقيه
pure substance which has fixed chemical composition such as water(solid -liquid-vapor) the pure substance may be one chemical element or coumpound and may be more chemical elements or coumpounds

but should be homogenieus such as amixture of liquid water and vapor
water because this mixture is homogenieus and the mixture of water and oil
is not pure substance because it is not homogenieus
ان شاء الله يكون موضوع مفيد



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