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The Steam and Vapor are the same thing i.e. Water in its gaseous state.

However Steam is formed by Forced Boiling and is at a pressure greater then the atmospheric pressure as used in a Steam Engine.

Water Vapour is free conversion of Water from Liquid to Gaseous Stage thru evaporation. It is in approximate equilibrium with atmospheric pressure

Steam is formed by by raising the Temperature (giving heat energy) of water above its Boiling Point i.e. 100 deg Celsius whereas evaporation of water (from water bodies) may occur at temperature way below the boiling point i.e. 30 deg Celsius. Drying of washed clothes is an example

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