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Just an historical legacy. Water is dihydrogen monoxide but it is always called water. Steam, water vapour are just common words that have been adopted into science. Technically, gasses cannot be seen. So if you can see the steam or vapour then it is not a gas but has already started to condense.

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13y ago
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6mo ago

Steam is called water vapor because it is the gaseous state of water. The term "gas" generally refers to substances that exist in the gaseous state at room temperature and pressure, whereas "vapor" specifically refers to the gaseous form of a substance that is normally a liquid or solid at room temperature and pressure. In the case of water, it is usually a liquid, so its gaseous state is specifically referred to as water vapor.

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Q: Why is steam called water vapor and not water gas?
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