Water Vapor
Definition
Water vapor is the gaseous phase of water. It's invisible and occurs when water evaporates or boils, changing from a liquid or solid state into a gas.
Analogy
Think of water vapor like steam rising from your hot cup of cocoa on a cold day. You can't see the individual molecules, but you know they're there because you can see the steam.
Related terms
Evaporation: This is the process by which water changes from a liquid to a gas or vapor.
Condensation: The process where water vapor becomes liquid. It's like when dew forms on grass in the morning.
Sublimation: This is when a substance goes directly from a solid to a gas, skipping the liquid phase, like dry ice does.
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