[填空题]
In humid climates, people constantly dehux.4n a9 logrd9midify thn phw7)-u1q i jaju3s5eir cellars to prevent rot and mildew. If the cellar in a house (kept atwju-u p7q nh31 is5aj) 20$^{\circ} $C) has 95 $m^2$ of floor space and a ceiling height of 2.8 m, what is the mass of water that must be removed from it to drop the humidity from 95% to a more reasonable 30%? kg