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Originally posted by pbasonuk
No evidence exists that chemtrails exist?
Are you taking the p*ss or just trolling for a fight?
Fact 3, contrails are the same thing as clouds
Originally posted by MagicWand67
reply to post by network dude
Fact 3, contrails are the same thing as clouds
False, not fact at all.
Your argument is invalid.
Contrails are a concern in climate studies as increased jet traffic may result in an increase in cloud cover. Several scientific studies are being conducted with respect to contrail formation and their climatic effects. Cirrus clouds affect Earth's climate by reflecting incoming sunlight and inhibiting heat loss from the surface of the planet. It has been estimated that in certain heavy air-traffic corridors, cloud cover has increased by as much as 20%. Since contrails can spread out and essentially become cirrus clouds, it is felt that contrails may affect the planetary climate in similar ways. Other studies are underway to better understand the role that jet exhaust itself plays in modifying the chemistry of the upper levels of the atmosphere.
Why? Well, according to science, vapor will form when air warmer than the surrounding air cools, and as we all know warmer air holds more moisture than cooler air, and the water will condense into small, visible droplets that are quickly dispersed.
So if we have normal contrails forming at 30,000 feet or so, the only way for them to form much lower in elevation is if the air is as cold or colder, and there is actually no way to explain them persisting unless they contain particles apart from H2O.
Originally posted by MagicWand67
reply to post by network dude
Fact 3, contrails are the same thing as clouds
False, not fact at all.
Your argument is invalid.
"Contrail - streamer of cloud sometimes observed behind an airplane flying in clear cold humid air. It forms upon condensation of the water vapor produced by the combustion of fuel in the airplane engines. When the ambient relative humidity is high the resulting ice-crystal plume may last for several hours. The trail may be distorted by the winds and sometimes it spreads outwards to form a layer of cirrus cloud." - Encyclopædia Britannica 1993.
This is of particular concern in well-traveled air corridors, where contrails by the hundreds can spread into man-made cirrus clouds that can both block sunlight from reaching the Earth and trap radiated heat from escaping to space.
NASA scientists have found that cirrus clouds, formed by contrails from aircraft engine exhaust, are capable of increasing average surface temperatures enough to account for a warming trend in the United States that occurred between 1975 and 1994.
"This result shows the increased cirrus coverage, attributable to air traffic, could account for nearly all of the warming observed over the United States for nearly 20 years starting in 1975, but it is important to acknowledge contrails would add to and not replace any greenhouse gas effect," said Patrick Minnis, senior research scientist at NASA's Langley Research Center in Hampton, Va. The study was published April 15 in the Journal of Climate. "During the same period, warming occurred in many other areas where cirrus coverage decreased or remained steady," he added.
The most common form of high-level clouds are thin and often wispy cirrus clouds. Typically found at heights greater than 20,000 feet (6,000 meters), cirrus clouds are composed of ice crystals that originate from the freezing of supercooled water droplets. Cirrus generally occur in fair weather and point in the direction of air movement at their elevation.
Since air temperatures at these high atmospheric levels are very cold (generally colder than -40 F), only a small amount of liquid is necessary for condensation to occur. Water is a normal byproduct of combustion in engines.
Originally posted by MagicWand67
reply to post by Uncinus
Looking the same and being the same are entirely different.
It would be like saying the steam from your car exhaust pipe is the same as when you exhale.
Chemtrails may exist, or they may not. No scientific data exists to offer proof one way, or the other
The long term health effects of our military veterans has been widely debated. Earlier studies had found no variation in the cancer rates of a soldier who had fought in Vietnam as compared to a man of the same age who had not spent any time in Vietnam. New studies do refute those prior arguments.