In regions with dry climates, evaporative coolers are used to cool air. A typical electric air conditioner is rated at 1.00 × 104 Btu/ h (1 Btu, or British thermal unit, equals the amount of energy needed to raise the temperature of 1 lb of water by 18F). How much water must be evaporated each hour to dissipate as much heat as a typical electric air conditioner?