the Meteorological obsmetry of silk and balloon carrying weather instruments into air if a balloon is 2.8 in diameter find the area of silk used
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The best basic materials for extensible balloons are high‑quality natural rubber latex and a synthetic latex based upon polychloroprene. Natural latex holds its shape better than polychloroprene – which is stronger and can be made with a thicker film for a given performance. It is less affected by temperature, but more affected by the ozone and ultraviolet radiation at high altitudes, and has a shorter storage life. Both materials may be compounded with various additives to improve their storage life, strength and performance at low temperatures both during storage and during flight, and to resist ozone and ultraviolet radiation. As one of the precautions against explosion, an antistatic agent may also be added during the manufacture of balloons intended to be filled with hydrogen.