wet-bulb depression

American  

[wet-buhlb di-presh-uhn] / ˈwɛtˌbʌlb dɪˌprɛʃ ən /

noun

Meteorology.

1. the difference between the dry-bulb temperature and the wet-bulb temperature, with a larger depression representing less atmospheric humidity.

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Etymology

Origin of wet-bulb depression

First recorded in 1820–30

Example Sentences

One interesting fact to be noticed, after wading through these tables, is this—that, as a general result, the transparency of the air increases about 3·7 times for any increase in dryness from 2° to 8° of wet-bulb depression.

From Project Gutenberg

All the observations taken when the wet-bulb depression was between 2� and 4� were put in one table, all those when it was between 4� and 7� in another, and all those when it was over 7� in a third.

From Project Gutenberg

In the tables above referred to along with the number of particles was entered the limit of visibility at the time; when this was done it was at once seen that as the number of particles increased the limit of visibility decreased, as will be seen from the following short table of the Rigi Kulm observations when the wet-bulb depression was between 2� and 4�.

From Project Gutenberg

Wet-bulb depression 2� to 4� 4� to 7� 7� and over Mean values of C. 76,058 105,545 141,148 From the above table it will be seen that as the dryness of the air increased it required a larger number of particles to produce a complete haze, nearly double the number being required when the wet-bulb depression was over 7� than when it was only from 2� to 4�.

From Project Gutenberg

To find the number of particles required to produce a complete haze, that is, to render a mountain just invisible, all that is necessary is to multiply the above constant C. by 160,930, the number of centimetres in a mile, when this is done with the observations made in the West Highlands we get the numbers given in the following table:— Wet-bulb depression.

From Project Gutenberg