…showed first 75 words of 448 total…

…showed last 75 words of 448 total…ood products such as margarine and shortenings from animal or vegetable fats and oils. Tugsten and molybdenum are prepared by treating their oxides or salts with hydrogen. Even though fuel cells have been around for about 150 years we are just now beginning to develop them. The fuel cell is dependant upon hydrogen. Hydrogen is very hard to obtain cheaply. The only feasible way to get it is by removing it from a compound, usually hydrocarbons.