A time constant is the amount of time it takes for a meteorological sensor to respond to a rapid change in a measurand until it is measuring values within the accuracy tolerance usually expected of the sensor.
This most often applies to measurements of temperature, dewpoint temperature, humidity and air pressure. Radiosondes are especially affected due to their rapid increase in altitude.
Famous quotes containing the words time and/or constant:
“Our fathers water’d with their tears
This sea of time whereon we sail,
Their voices were in all men’s ears
Who pass’d within their puissant hail.
Still the same ocean round us raves,
But we stand mute, and watch the waves.”
—Matthew Arnold (1822–1888)
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—Phyllis McGinley (1905–1978)