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Question
From the above figure, what is the typical form of a substance in state C?
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Solution
The correct option is C Gas
The gas–liquid–solid triple point of water corresponds to the minimum pressure at which liquid water can exist.
At pressures below the triple point (as in outer space), solid ice when heated at constant pressure is converted directly into water vapour in a process known as sublimation.
Above the triple point, solid ice when heated at constant pressure first melts to form liquid water, and then evaporates or boils to form vapour at a higher temperature.
Hence, the correct option is C.
The gas–liquid–solid triple point of water corresponds to the minimum pressure at which liquid water can exist.
At pressures below the triple point (as in outer space), solid ice when heated at constant pressure is converted directly into water vapour in a process known as sublimation.
Above the triple point, solid ice when heated at constant pressure first melts to form liquid water, and then evaporates or boils to form vapour at a higher temperature.
Hence, the correct option is C.
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