In the food industry, hydrogen is used in the hydrogenation of oils to create margarine and shortening. This process involves adding hydrogen atoms to unsaturated fats in the presence of a catalyst. Hydrogenation of fats usually extends the shelf-life of food products, however these fats are usually less healthy.
Used as a gas for balloons because it is lighter then air. Helium is often the gas of choice for balloons, however, because hydrogen is explosive. Hydrogen is infamously known for its role in causing the Hindenberg disaster in 1937. The Hindenburg was an airship filled with hydrogen which caught fire and exploded, killing 35.
Used in combination with nitrogen to produce ammonia in the Haber Bosch Process in the following reaction: H2+N2 --> NH3. Ammonia is used as a cleaning solvent and a fertilizer. The Haber Bosch Process is responsible for producing 500 million tons of fertilizer per year!