The hydrogen reacts with oxygen to produce electricity and water.

VOA: special.2009.09.07

The cells created electricity by mixing hydrogen with oxygen.

VOA: special.2009.06.24

Far below sea level, they contain some of the harshest environments on Earth, with no oxygen and no light.

VOA: special.2010.11.10

Doctors say that over time the damage interferes with the natural exchange of oxygen and carbon dioxide in the lungs.

VOA: special.2010.06.23

But a drop in oxygen levels can cause a health emergency in people with heart or lung problems.

VOA: special.2009.07.14

The astronauts were three hundred twenty thousand kilometers from Earth with little oxygen, electricity and water.

VOA: special.2009.07.22

The balloons contain helium and oxygen so that they float around with the air currents.

VOA: special.2010.09.05

"Until he saw me walking around with a can of liquid oxygen.

VOA: special.2010.06.23

These problems were more common among males, those with injured nerve tissue in the brain and those who had been given oxygen supplies for days as a baby.

VOA: special.2010.11.30

Researchers also found that oxygen could stop the headache pain and eliminate other symptoms associated with cluster headaches, such as red,swollen and watery eyes.

VOA: standard.2009.12.17

"He saw me walking around with a can of liquid oxygen.

VOA: standard.2010.06.21