when we breathe we inhale oxygen, o2, and exhale carbon dioxide, co2, plus water vapor, h2o. The air we exhale has more mass and breathing causes you to lose weight.
A colourless, flavourless, and odourless gas called oxygen is vital to all living things. Animals absorb it and then convert it to carbon dioxide, which plants then use as a source of carbon dioxide and release back into the atmosphere. Only when held at extremely low temperatures does oxygen become a liquid; otherwise, when released under pressure from cold storage, oxygen becomes a gas. Small or big insulated containers that can be filled up again can be used to store liquid oxygen. A molecule of oxygen, a non-metallic element, can be found in nature. Two oxygen atoms that are tightly bound together form the building blocks of each molecule. At room temperature, oxygen is in a gaseous state due to its low melting and boiling temperatures.
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