With participation level at nearly a quarter of the population (22 percent), bowling rolled by such popular sports and activities as basketball (15 percent), golf (13 percent), aerobics (11.9 percent), baseball (13 percent) and yoga (9 percent) to secure the number one ranking.
Definition of FUEL CELL. : a device that continuously changes the chemical energy of a fuel (as hydrogen) and an oxidant directly into electrical energy.
Hydrogen fuel cells power the shuttle's electrical systems, producing a clean byproduct-pure water, which the crew drinks. A fuel cell combines hydrogen and oxygen to produce electricity, heat, and water. Fuel cells are often compared to batteries. Both convert the energy produced by a chemical reaction into usable electric power. However, the fuel cell will produce electricity as long as fuel (hydrogen) is supplied, never losing its charge.