Very good presentation: Q: Is it possible to get 10 kg/or 10 grams of oxygen matterial please? I am asking for that oxygen matteral because it is written in particle physics books that each atom of oxygen atom contains some physical mass. That means massive objects are accumulate able into a container. right? so please send me a 10 kilogram or 1 ram oxygen. So, that I can prove existence of Oxyen mathematically or logically. otherwise all parts of the physics are a lie. right?thanks. thanks.