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When we measure temperature, we don't measure the ground temperature, we measure the air


When we measure temperature, we don't measure the ground temperature, we measure the air25-09-2016 21:52
Tai Hai Chen
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(1085)
temperature about 1 to 2 meters above the ground. That's where we put thermometer. Nobody lives on the ground. People feel the air about 1 to 2 meters above the ground. That's the temperature they care about. True, the air absorbs heat from the ground, making the ground cooler than it otherwise would be, but the air means temperature about 1 to 2 meters off the ground is warmer than otherwise. If you look at Mars, which has much less air than Earth, 1 meter off the ground is about 20 C less than the ground, 2 meters off the ground is about 40 C less than the ground. On Earth, which has much more air, 2 meters off the ground is essentially the same temperature as the ground, not even 0.1 C difference.
Edited on 25-09-2016 21:54
25-09-2016 22:14
Into the NightProfile picture★★★★★
(13500)
Tai Hai Chen wrote:
temperature about 1 to 2 meters above the ground. That's where we put thermometer. Nobody lives on the ground. People feel the air about 1 to 2 meters above the ground. That's the temperature they care about. True, the air absorbs heat from the ground, making the ground cooler than it otherwise would be, but the air means temperature about 1 to 2 meters off the ground is warmer than otherwise. If you look at Mars, which has much less air than Earth, 1 meter off the ground is about 20 C less than the ground, 2 meters off the ground is about 40 C less than the ground. On Earth, which has much more air, 2 meters off the ground is essentially the same temperature as the ground, not even 0.1 C difference.


The air doesn't magickally remain warmer at some fixed altitude by itself.

Air is mass. It is less mass than the ground. It will cool off faster than the ground because of it.

In general, whether you are an airplane flying at 30,000 feet, or a bug flying at 2 feet. Air cools as you rise.

The only exception to this is if warm air (warmed from somewhere else) flows over colder air (and ground). We call that a warm front.


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25-09-2016 22:45
Tai Hai Chen
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Into the Night wrote:Air is mass. It is less mass than the ground. It will cool off faster than the ground because of it.


Air cools slower than ground just like water cools slower than ground. Air molecules retain heat by conduction with each other.

If you compare ocean and land. Ocean does not freeze. Ocean has very little temperature variation year round. Water is warm year round. Land like Greenland freezes up in winter at about -30 C. Arctic ocean around Norway and Iceland do not and is about 10 C.
Edited on 25-09-2016 22:47
26-09-2016 01:02
jwoodward48
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(1537)
Water has a very high specific heat. Air does not. "Conduction with itself" doesn't cause specific heat. That's nonsensical.
26-09-2016 20:20
Into the NightProfile picture★★★★★
(13500)
jwoodward48 wrote:
Water has a very high specific heat. Air does not. "Conduction with itself" doesn't cause specific heat. That's nonsensical.


Couldn't have said it better myself.


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