tag:blogger.com,1999:blog-16612221.post3934050085671344875..comments2024-03-19T03:14:04.172-04:00Comments on Rabett Run: TemperatureEliRabetthttp://www.blogger.com/profile/07957002964638398767noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-16612221.post-63909140108898498142017-03-04T20:31:10.640-05:002017-03-04T20:31:10.640-05:00"If you point the thermometer at the sky and..."If you point the thermometer at the sky and measure -20°C, this doesn't mean that this is the <br />temperature of the sky; it just means that the total thermal radiation emitted by the sky above you is rather <br />modest."<br />http://www.cmmap.org/scienceEd/summercourse/summerCourse15/WhatDoInfraredThermometersMeasure.pdf<br /><br />> humidity, clouds<br />Water vapor is a greenhouse gas<br /><br />Dry nights after it's gotten so cold the water vapor has frozen out and fallen as snow are instructive.<br />Hank Robertshttps://www.blogger.com/profile/07521410755553979665noreply@blogger.comtag:blogger.com,1999:blog-16612221.post-47922522533468117722017-03-03T06:53:51.076-05:002017-03-03T06:53:51.076-05:00I've always liked Matt Strassler's take on...I've always liked <a href="https://profmattstrassler.com/2014/01/07/happy-chilly-new-year/" rel="nofollow">Matt Strassler's take on temperature</a>:<br /><br />"<i>The temperature of an ordinary material is simply a measure of the average amount of random, invisible motion that the molecules in that material are undergoing, or, more precisely, a measure of the average speed and motion-energy that those molecules have. Molecules in colder objects move more slowly than molecules in hotter objects; that’s all there is to temperature!<br /><br />... And our senses don’t tell us that even on a calm day, with no wind, the molecules of the air surrounding us are zipping around at a cool 1600 feet (500 meters) per second — faster than the speed of sound, and around five times the wind speeds of the most powerful hurricanes."</i>Kevin O'Neillhttps://www.blogger.com/profile/06692943768484857724noreply@blogger.comtag:blogger.com,1999:blog-16612221.post-5376829251704890002017-03-03T03:36:15.511-05:002017-03-03T03:36:15.511-05:00E.S., i believe the thermometer measures an averag...E.S., i believe the thermometer measures an average temperature from the surface to the top of the troposphere. The actual clear sky measurement will change with humidity. The more humidity, the warmer the measurement, other things being equal. This tells me it's possible to develop a ground station with thermometers aimed at multiple angles, and this should allow us to estimate humidity as well as forcing caused the greenhouse effect caused by the Chinese conspiracy.Fernando Leanmehttps://www.blogger.com/profile/16085680730729620836noreply@blogger.comtag:blogger.com,1999:blog-16612221.post-25886019028623332522017-03-01T17:06:55.341-05:002017-03-01T17:06:55.341-05:00FL, I've performed the same experiment, since ...FL, I've performed the same experiment, since acquiring one of those neat Chinese hand held infrared thermometers. When outside on a clear, cold winter day, the reading directly overhead can be astonishingly low, maybe -50 C. The other thing I noticed was when I pointed the device at the surface of a solar thermal collector plate which has a selective surface coating. As the plate was exposed to sunlight, it was quite hot to the touch, yet, the instrument reading didn't indicate that temperature level. My device allows adjustment for surface emissivity and when I lowered that to around 0.10, the reading was more reasonable. Since the device expects a black body temperature with fixed emissivity, measuring the down welling emissions from overhead may give a misleading result, IMHO.E. Swansonhttps://www.blogger.com/profile/16458400506150142847noreply@blogger.comtag:blogger.com,1999:blog-16612221.post-13136250537906184542017-03-01T14:56:07.674-05:002017-03-01T14:56:07.674-05:00Lately I developed a habit, I take my pistol therm...Lately I developed a habit, I take my pistol thermometer, stick it out the window, and point it at the ocean, the sky, a nearby building, etc. pointing it at clear sky on a cool night gives really nice readings of temperature way up there in heaven. Try it.Fernando Leanmehttps://www.blogger.com/profile/16085680730729620836noreply@blogger.comtag:blogger.com,1999:blog-16612221.post-20630117051645410582017-03-01T06:51:29.165-05:002017-03-01T06:51:29.165-05:00There are times when you just feel good about your...<i>There are times when you just feel good about yourself. These especially include times when you are trying to explain something and you find that your understanding is as good, if not better than what you find in the literature.</i><br />Please don't go all Gerlach & Tscheuschner on us...cynicushttps://www.blogger.com/profile/14387605863998271645noreply@blogger.com