Canister of oxygen gas. Oxygen is a colourless, odourless, and tasteless gas that is essential for life. It makes up about 21% of the Earth's atmosphere and is necessary for the respiration of all animals and plants. It is also used in medicine, welding, and metal cutting. | |
Licence : | Libre de droits |
Crédit: | Science Photo Library / Bulgar, Wladimir |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |