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?????? ?????? ?? ????? ????? ?????? ?????? ??? ????? ?? ?????? ?????? ?? ????.??? ???? ???? ???? ?? ?????? ??????, ???????? ??? ????? ??????.
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????? ????? ?? ????? ???? ????? (????? ????? ℃), ???? 245 ?????, ?????? ????? (2.529 / cm3) ????????? ?????? ??????, ??? ????? ????? ?????? ??????, ?????? ????? ?????? ????, ??? '?? ??????? ?????????? ???????? ??? ????? ?????, ????? ???? ?? ????? ?? ???? ????? ????? ?? ????????? ?????, ?????? ????? ?????????????????, ???? ????????? ?????, ?????? ??????. ??? ?????? ???? ?? ???? ????? ????? ????? ??? ??? ?????? ????? ??????? ??????.