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Date: 14-12-2018
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Date: 30-3-2019
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Date: 24-10-2018
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Helium is the only element that cannot be solidified by lowering the temperature at ordinary pressures; this must be accompanied by a pressure increase. The volume of solid helium, 3He and 4He, can be decreased by more than 30% by applying pressure. Solid helium has a projected density of 0.187 ± 0.009 g/mL at 0 K and 25 bar. Solid helium also has a sharp melting point and a crystalline structure. There are two forms of liquid helium: He4I and He4II.
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الصين.. طريقة لمنع تطور قصر النظر لدى تلاميذ المدارس
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ماذا سيحدث خلال كسوف الشمس يوم السبت؟
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قسم الشؤون الدينية يختتم محاضراته الرمضانية في صحن مرقد أبي الفضل العباس (عليه السلام)
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