:: With a supercritical gas there will be no point where you could see a liquid condense, or boil.
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McLachlan has filed various patents including : Drying, extracting with sub or supercritical gas and Milk and milk products for preventing or treating heart disease
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Rigid liquids are rigid like a solid on short time scales, but flow like a liquid on long time scales; while a supercritical gas-like fluid has the dynamic motions of a gas but is able to dissolve materials, like a liquid.
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:: : The article says that for temperatures between 270 K and 330 K, the pressure is 1-2 MPa . That's more than ten times atmospheric pressure, and it happens to be the exact zone where hydrogen transitions from a gas to a supercritical gas-liquid state.