Uses of gases

1. Nitrogen

1.1. 78%

1.2. Fire extinguisher

1.3. Ammonia and Nitric Acid

1.3.1. Nylon and fertilisers

1.4. Nitric Acid

1.4.1. Fireworks

2. Carbon Dioxide

2.1. Photosynthesis

2.2. Aerated drinks

2.3. Fire extinguishers

2.4. Dry ice (prevent melting)

3. Oxygen

3.1. 21%

3.2. Living things during respiration

3.3. Diving tank

3.4. Welding