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Fourth sound experiments on superfluid 3 He in aerogel were carried out. Two aerogel samples were prepared, one is 98% porous aerogel and the other is 99%. The aerogel was grown inside a sintered Ag powder to avoid vibration of the aerogel. Fourth sound of superfluid 3 He was observed at several pressures, and the superfluid fraction was estimated from the sound velocity. The superfluid...