No Chemtrails last Tuesday and it was really hot in New Jersey

a reply to: oldcarpy

Aluminium makes up about 8% of the Earth's crust by mass. So is it really surprising that it is found in soil and the water supply?

Only if you believe chemtrails exist...other than that not at all.

originally posted by: Zaphod58
a reply to: Soylent Green Is People

The general rule of thumb is that it drops about 5.5 degrees per 1000 feet.

I have a noob-like question. Hopefully you can answer it. It is said that when sun falls on the moon, the temperature rises rapidly to 150 degrees or thereabouts. This in an environment with little to no atmosphere. When night falls the temperature plummets. Why does it get colder the higher a plane goes and the thinner the atmosphere, even when flying in direct sunlight? If you can answer, please put it in layman's terms.

Also what does the "fsme" in your avatar stand for? I've seen a few members with it and thought it was a mod thing but I've seen members who aren't mods who also sport the letters in their avatars. TIA

originally posted by: LightSpeedDriver

originally posted by: Zaphod58
a reply to: Soylent Green Is People

The general rule of thumb is that it drops about 5.5 degrees per 1000 feet.

I have a noob-like question. Hopefully you can answer it. It is said that when sun falls on the moon, the temperature rises rapidly to 150 degrees or thereabouts. This in an environment with little to no atmosphere. When night falls the temperature plummets. Why does it get colder the higher a plane goes and the thinner the atmosphere, even when flying in direct sunlight? If you can answer, please put it in layman's terms.

TIA

It's because the pressure is lower and the air is thinner so there's fewer air molecules per unit volume to hold the heat

a reply to: LightSpeedDriver

FSME is Forum Subject Matter Expert. It's not really used anymore but at one point the FSMEs had limited mod powers in the forum they were considered an expert in.

a reply to: dfnj2015

You can check the humidity and temperature at contrail altitude easily. One good site is earth.nullschool.net. Click on the location you want and you can choose all sorts of parameters. For contrails you want to choose 250mb, which is the pressure at about 35,000 feet. You can choose to display the temperature or the humidity at that altitude, and you can alter the time and date to check the conditions from previous days, years back in the past.

You can even go a few days into the future to display the predicted conditions from the weather models. That way you can predict whether contrails will persist. It's not 100% accurate for predictions of course, as it only displays data for m a set altitude. You often get contrails at one height but none a couple of thousand feet above or below.

originally posted by: mrthumpy

It's because the pressure is lower and the air is thinner so there's fewer air molecules per unit volume to hold the heat

Yet there's NO air /pressure on the moon, and it's (supposedly) twice as hot as Earth is!!

How about that?

a reply to: turbonium1

Where do you get that idea from? There's no air on the moon so to talk about "the temperature" is pretty meaningless, as there is no ambient temperature. All you can measure is the temperature of individual surfaces, which of course will vary hugely depending on their properties and where they are in relation to the sun etc. That would be like measuring the temperature of a sidewalk in Arizona in the afternoon, or the snow surface in Antarctica in winter, and claiming that represented the temperature of the Earth

You could also define the temperature as the black body equilibrium temperature, which would be essentially the same on the moon as on the Earth, because they are basically the same distance from the sun.

originally posted by: turbonium1

originally posted by: mrthumpy

It's because the pressure is lower and the air is thinner so there's fewer air molecules per unit volume to hold the heat

Yet there's NO air /pressure on the moon, and it's (supposedly) twice as hot as Earth is!!

How about that?

That's amazing

a reply to: dfnj2015

For what it's worth I totally agree with 1998-99 as when these started en masse. Not only did they criss cross the sky almost every day , we had a very small airport back then in Traverse Michigan. During that time I would say one person in four developed sinus infections.

a reply to: bluemooone2

Aircraft flying from an airport near you aren't going to leave contrails. It's the ones that fly over from other airports that leave them, so the size of the airport near you doesn't matter. The new engines became really prevalent with the introduction of the Boeing 777 in 1993.