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Which approximate rate of increase does that relation give near 288 kelvin?

  • A.About 20 per cent per kelvin
  • B.About 100 per cent per kelvin, so that the saturation value would double for each kelvin of warming applied
  • C.About 7 per cent per kelvin
  • D.About 1 per cent per kelvin, which would make the moisture content almost independent of the temperature

Answer: C

The saturation vapour pressure rises about 7 per cent for each kelvin near terrestrial temperatures, which corresponds to a doubling for roughly every 10 kelvin. That single number underlies the water vapour feedback, the intensification of extreme rainfall and the shape of the moist adiabat. It varies slowly with temperature but 7 per cent is a good working value across the relevant range. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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