Talk:Hygrometer

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[edit] varying quality

this company sells about 9 different hygrometers. Can anyone account for why the different units show somewhat different humidity percents? The readings generally diverge from each other by approximately 5 percent points. I've seen 7% difference once. Nastajus 07:14, 19 August 2006 (UTC)

[edit] technically challenging

Humidity measurement is one of the more challenging technical problems in basic physics, mainly because small microclimate variations from place to place make it nearly impossible to maintain a consistent RH throughout the environmental chamber used for calibrating the devices. Two thermometers can be compared by immersing them in an insulated vessel of water and stirring vigorously to minimize temperature variations within the container, but air is many orders of magnitude less efficient as a heat-transfer medium (just compare the cross-sectional area of the pipes used to distribute heat from the furnace in a house with hot-water heating to the cross-sectional area of the ductwork used to distribute heat in a house with forced-air heating!). Unless one wishes to purchase highly-specialized equipment costing thousands of dollars, the most accurate means available to most of us for humidity measurement is a good-quality wet-dry psychrometer. Actually if a bunch of cheap digital devices are all within 5 percentage points of each other they are doing rather better than is typical of such devices! 71.235.75.86 11 August 2007

Well a year later I got my answer! Thank you. They sat in a row next to each other, 1 foot apart. Perhaps the humidity would be really different at the other end of the store, away from the doorway. I've added the ip reference, for whatever it's worth. Nastajus (talk) 04:26, 8 June 2008 (UTC)

[edit] Pix

Does anyone have a picture of a chart recording Hygrometer? Preferably the kind with two pens: red for temperature and blue for humidity? RJFJR 18:59, 3 October 2005 (UTC)

There are already three images of hygrometers on this page. How many do we really need?  :-) Tim Pierce 05:19, 7 December 2005 (UTC)

[edit] Coil type

Info on the metal(s) in a coil hygrometer would be good (there's already a picture of one). I bought some (non-adjustable) coil hygrometers and they appear to be extremely inaccurate, but I recall an accurate one from childhood.

[edit] Calibration

Is this calibration info good? If folks think it is, let's add a link or adapt it for use in the article.

[edit] WikiProject class rating

This article was automatically assessed because at least one WikiProject had rated the article as stub, and the rating on other projects was brought up to Stub class. BetacommandBot 09:54, 10 November 2007 (UTC)