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1answer
53 views

Decrease in temperature due to radiation

Can radiation cause the temperature to decrease? Because, in my Physics textbook, it is written that: ln winter nights, the atmospheric temperature goes down. The surfaces of windowpanes, flowers,...
3
votes
4answers
90 views

Would a helium ballon pop or freeze in space?

I have read these questions: Why doesn't Helium freeze at 0K? Do objects in space freeze immediately? Now I do understand that a helium balloon cannot float up to space. But let's assume this ...
1
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2answers
47 views

Is the Earth Atmosphere Model at this NASA site wrong?

I've been trying to get a decent numerical approximation (curve fit) of Earth's Atmosphere Model, and found what I was looking for at this NASA's web site. However, when checking some basic ...
2
votes
2answers
93 views

Temperature as function of $CO_2$

The carbon stored in fossil fuels must have been taken out of the earth atmosphere from CO2 in past periods by plants. Thereby reducing the amount of CO2 drastically and increasing the amount of O2 to ...
2
votes
3answers
83 views

Is there a difference between the red sky in the morning and in the evening?

It certainly has a different feeling to it, but does the temperature or earth's rotation or the clouds or anything else really make it two different physical phenomena or at least different colors? ...
0
votes
1answer
43 views

If the Sun had a larger surface temperature how would that affect its appearance to us in the sky?

I thought about this when I came across wiens displacement law which says the higher the temperature, the lower the peak wavelength. If the sun was a lot hotter, and its peak wavelength wasn't in the ...
3
votes
1answer
73 views

How much does temperature affect the time of sunrise?

Please forgive me if this is a dumb question, or if my understanding of basic physics is wrong. Please feel free to correct me. As I understand it, if the Earth didn't have any atmosphere, then the ...
1
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4answers
616 views

Why does the warm air rises up?

Warm air has more energy than cold air. This means that according to the Einstein equation $E = mc^2$ the warmer air has a greater mass than the cold one. Why is the warm air rising, if it has a ...
0
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1answer
46 views

why high pressure systems are colder in temperate climates?

How do we derive equations which relate the temperature and pressure anywhere in the atmosphere? (assuming earth is still so no coriolis effect and flat if that makes the problem any easier). Like ...
2
votes
1answer
101 views

How is temperature related to quantum vibrational states of molecules?

When a molecule of greenhouse gas absorbs a photon of long wave infrared radiation it is boosted to the next allowed vibrational state. The vibrational state, as I understand it, involves deformations ...
-2
votes
3answers
84 views

Max. air temperature on Earth [duplicate]

Is there any max. temperature that air on Earth could reach, assuming that solar radiation is standard and the average temperature on Earth is 14.6 like today? I mean, is there any chance that the ...
1
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2answers
85 views

Global warming and air temperature

The layman's question. Is there a maximum temperature that can be reached by air on Earth due to global warming? For example, one that would prevent living organisms from functioning? I read somewhere ...
0
votes
1answer
47 views

What makes an object mirror? [duplicate]

All objects reflect some of the colours and then our eyes are able to see object of different colours. But when we see mirage in a desert then it seems that the sand of the desert is acting as a ...
1
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1answer
57 views

Is it possible for a planet or a moon to exist with absolutely zero atmosphere?

Mercury has an atmosphere, no matter how thin that might be. Scientists say that the space is not completely empty because we can always find a few hydrogen atoms per kilometer all over the outer ...
3
votes
3answers
260 views

Is wind caused by differences in the atmospheric pressure or by differences in the atmospheric temperature or both?

I have heard that "Wind is caused by differences of atmospheric pressure" and "Wind is caused by differences of atmospheric temperature" both but I don't know for case that doesn't follow one of this. ...
0
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2answers
103 views

Given $2\text{ °C}$ atmospheric temperature rise, what would be the temperature increase if confined to an oven?

Consider the 2 °C average global atmospheric temperature rise as discussed by the IPCC. Assume an oven with an the interior that is a perfect cube having a volume of one cubic meter, empty of ...
0
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1answer
47 views

What causes the perceived intensity of the sun to change on a short timescale?

I was inspired by this question to ask, what causes the "beating down" feeling of the sun to vary day to day? While the linked post explains why the sun feels hotter in the summer than in the winter, ...
0
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1answer
132 views

Does atmospheric pressure increase temperature? [closed]

Is this wrong? If so, how: Gravity compresses the atmosphere. Gasses under pressure generate heat. Hot air rises. As it does, more cold air descends to be compressed and generate heat. Heat is ...
5
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3answers
507 views

Why is it severely cold high up in the atmosphere?

In the upper part of the atmosphere the kinetic temperature of air is of the order of 1000 K, even then one feels severe cold, why?
0
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2answers
132 views

What factors affects the cold temperatures in high altitudes?

Why it is that high altitude areas are colder than low altitude areas? Is it because the air pressure or any other? If we consider it with the sun rays, high altitudes receive sun rays earlier than ...
1
vote
4answers
270 views

Why we won't extract heat from air temperature?

There is a lot of energy in air's temperature? Why don't you harvest it? There is always difference that creates flow which can be piped into something converting it to mechanical energy...
-1
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2answers
75 views

If Earth had gravity and atmosphere, but no Sun, will Temprature change with altitude?

Gravity pulls down the atmosphere thus creating higher Atmospheric Pressure close to the surface, This pressure is adding Force to air molecules, and since Heat is essentially adding force to ...
1
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3answers
4k views

Why is it hot before raining?

What causes the temperature hike before a rain? I have heard explanations like one that says as the moisture rises, you sweat more. Can somebody provide a more scientific explanation for this.
3
votes
1answer
137 views

How warm are rain drops?

I thought of this question after a week of jogging, where each day after it rained, the temperature seemed warmer. I also noted this as a lifeguard where, after closing the pool due to thunder, we ...
0
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0answers
48 views

Water vapor carbon dioxide temperature (warming) nonlinear feedback mechanism

In this Youtube video clip starting at 1:12:45 of the debate on the feedback mechanism of the CO$_2$-water-vapour warming effect Professor Richard Lindzen stated that the feedback mechanism is not ...
0
votes
1answer
194 views

Why does the speed of sound relate to temperature in increasing altitude?

This graph is very puzzling to me. It is my understanding that the speed of sound relates to the density of the media it travels through. Sound travels faster in water, and even faster in steel. So ...
0
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1answer
1k views

If hot air rises, why is it colder at higher altitudes? [duplicate]

I read some of the answers on Does hot air really rise? But then I thought of places like Mount Everest and its summit. Why is it freezing and cold? If hot air rises shouldn't it be like a desert up ...
1
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0answers
315 views

What is the temperature of the clear day sky from the surface of Earth?

I read this thread: What is the temperature of the clear night sky from the surface of Earth? I don't know if this equation is also valid for day time. I don't think it is. I suppose the temperature ...
2
votes
3answers
310 views

Temperature distribution in a column of air

Say there is a sealed cylinder of air that has a height $\mathrm{h}$ and area $\mathrm{A}$ on the ends. The initial temperature throughout the column is $T_0$ and has a uniform initial density $\rho_0$...
3
votes
0answers
80 views

Behaviour of Altimeter at different temperatures

I have realized that the Altimeter of my bike computer (it uses Air Pressure to determine altitude and needs to be calibrated every start) is not consistent at different temperatures. At the Start ...
0
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1answer
20k views

Does density of air decrease or increase with altitude and relation of this with temperature? [closed]

I think the air density decrease as due to gravity more air woul be near the earth but as the hot air raises up doesn't it have momentarily increased the density at height (like in up troposphere) ...
3
votes
2answers
407 views

Can I cook an egg by holding it in thermosphere?

It is known that in thermosphere, air temperature is rising sharply with increase of altitude. In upper atmosphere, temperatures can even reach 2000°C or higher: see 2. However, air there is ...
0
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3answers
6k views

Can temperature rise after sunset?

Generally speaking I suppose temperature rises as long as the sun is up and then it continues to fall until sunrise the next day. I have once noticed temperature rise temporarily during night (In my ...
1
vote
3answers
8k views

Why is the speed of sound lower at higher altitudes?

At sea level the speed of sound is 760mph, but at altitudes like the Concorde would fly at (55,000ft) the sound barrier is at 660mph, so 1000th slower. Does it have to do with lower pressure?
4
votes
3answers
1k views

Temperature of a falling meteor

I am reading "What if?" article https://what-if.xkcd.com/20/ and I'm interested in it's scientific background. Mr. Munroe writes: As it [the meteor] falls, it compresses the air in front of it. ...
1
vote
1answer
215 views

Why do high altitudes have larger diurnal temperature variation than lower altitudes?

It seems like the lack of atmosphere should not be playing a role in the diurnal temperature variation because that's what makes it colder. Mountains are not that dry, usually.
12
votes
2answers
7k views

What is the temperature of the clear night sky from the surface of Earth?

Before you all jump in with 2.73 K or thereabouts, this is more of an experimental question. It will obviously depend on humidity and radiation being scattered back towards the surface of the Earth. ...
0
votes
1answer
1k views

How does heating in the atmosphere look above 100 km

I have tried without luck to find a graph of temperature change through the atmosphere that goes further up than about 100 km. On this graph: (Source: http://www.windows2universe.org/kids_space/...
2
votes
1answer
181 views

Why do tires need to be inflated when the temperature changes?

Why do you need to add air to your tires when the temperature drops? The temperature inside and outside of the tire is the same (let's assume that you aren't currently driving, and your car has been ...
3
votes
1answer
437 views

Dry adiabatic lifting

If an unsaturated air parcel ascends adiabatically in the atmosphere with an initial temperature, would the final temperature of the air parcel, when it reaches it's destination, be the same at the ...
7
votes
2answers
915 views

How hot is aurora?

Has anyone done research on how hot aurora is? I mean if it is plasma it should be hot and since it is emitting mostly green light due to nitrogen (~78%) in the air, could it then be considered that ...
1
vote
2answers
3k views

How Temperature, Pressure and Altitude are related in the atmosphere?

I'm looking for an approximation for the temperature of the atmosphere at any height and pressure. Both altitude and pressure are known variables, I've derived this equation using maxwell's ...
3
votes
3answers
1k views

How can anything be hotter than the Sun?

I've heard that if a space shuttle enters the atmosphere from a bad angle its surface will become so hot that it will be hotter than the surface of the Sun. How can that be? It seems to an uneducated ...
24
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5answers
53k views

Why less temperature at high altitude

Why there is always cold at high altitudes. e.g. at peak of mountains. Also as we go high from sea level, temperature starts decreasing. Why is it?
3
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1answer
488 views

Hail stones in summer?

This has always puzzled me. Yesterday (in London) it started hailing despite it being about $20^oC$. A couple of years ago I experienced hail in Sicily when it was about $35^oC$ in the shade!. How is ...
23
votes
5answers
147k views

Why does the road look like it's wet on hot days?

Often, I'll be driving down the road on a summer day, and as I look ahead toward the horizon, I notice that the road looks like there's a puddle of water on it, or that it was somehow wet. Of course, ...
6
votes
5answers
27k views

How can I calculate Vapor Pressure Deficit from Temperature and Relative Humidity?

I have a series of measurements of temperature and relative humidity (RH), together with mosquito capture data. Because mosquitoes are sensitive to desiccation, it's reasonable that RH may be useful ...
9
votes
6answers
11k views

Why doesn't air freeze?

I am in no way experienced in the Physics field so this question may seem a bit silly but i'd appreciate an answer :) Why doesn't air freeze?