a huge tank contains 80,000 liters of oxygen, at a pressure of 760mmHg. If the oxygen is to be replaced into cylinder of 20 liters capacity at a pressure of 3040mmHg, how many cylinders will be needed?

According to the passage, which of these is true about gray water systems? a) gray water systems use plants that require less water. eliminate b) gray water systems require the use of less fossil fuels. c) gray water systems reduce the amount of fresh water used. d) gray water systems reduce the amount water used by shower heads.