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:
“Continual success in obtaining those things which a man from time to time desireth, that is to say, continual prospering, is that men call FELICITY; I mean Felicity of this life. For there is no such thing as perpetual Tranquillity of mind, while we live here; because Life it self is but Motion, and can never be without Desire, nor without Faeroe, no more than without Sense.”
—Thomas Hobbes (1579–1688)
“I am constant as the northern star,
Of whose true-fixed and resting quality
There is no fellow in the firmament.”
—William Shakespeare (1564–1616)