At any pressure, water below its saturation temperature is said to be in a sub saturated state.

For example, water at a pressure of 1 atmosphere and a temperature below the saturated temperature of 100°C is sub saturated. Water at a pressure of 10 atmospheres has a saturation temperature of 180°C, and so water below this temperature is also sub saturated.

Learn more about steam in our tutorial - What is Steam.

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Steam Saturation Curve