Sentences with phrase «absorb ir»

Both will absorb IR well, so that is the same for both.

The reason that N2 and O2 and H2 do not absorb IR is not that they have no dipole (since neither does CO2), but because, being diatomic, they have no asymmetric vibrational modes, which are the ones that absorb in the IR range.

(There are some unimportant exceptions — for example O2 or N2 with different isotopes can absorb IR weakly for example.

(in fact, according to this table http://www.omega.com/temperature/z/pdf/z088-089.pdf, flat white paint will absorb IR slightly BETTER than flat black!)

Just like the Crookes radiometer, carbon dioxide doesn't just absorb IR, it also emits it.

3 If GAT is higher due to the presence of CO2 and H2O in the atmosphere is this because of their greenhouse properties; that is their capacity to absorb IR?

Either of these GHGs will gain energy if they absorb IR from the ground (or from GHGs in the atmosphere), but then when they collide with other molecules (almost always N2 or O2) they will give away that extra energy until they are at the same average energy as the rest of the air.

So the sea could absorb IR, but as it happens, the net flow through that path is upward.

On Earth, water clouds absorb IR so strongly before there is any opportunity for scattering.

GHG's absorb IR energy.

Because CO2's ability to absorb IR increases linearly at low concentrations (under 100ppm) a minimal amount even absent most water vapor serves to keep the earth just warm enough to prevent a snowball earth episode most of the time.

Water vapor molecules do continue to absorb IR radiation (i.e. «heat up») after they leave the surface of the ocean.

Further, stretching the N - N bond does not produce a change in dipole moment, so the vibration is infrared inactive (i.e., can not directly absorb IR radiation).

The glass panes heat up when they absorb IR and lose it right away through conduction.

Since the steady - state temperature of the earth is determined by the balance between what it receives from the sun and what it emits back out into space, an IR - absorbing atmosphere will in fact cause the earth's steady - state temperature to be higher than it would be if the atmosphere did not absorb IR.

The whole AGW warming hypothesis is based on the single unmeasured effect of CO2 to absorb IR and therefore possibly warm as opposed to absorb / emit / scatter.

This means it can not easily emit or absorb IR across the vacuum gap.

When Eli last left the bunnies, he was pointing out how gravity explains much of the greenhouse effect, well, except for the part that you need some things in the atmosphere that absorb IR radiation from the surface.

Moreover, since gas molecules don't absorb IR across the spectrum but only on molecular lines, cutting off the radiative heat flow would not be nearly as effective as simply silvering the walls and pulling a vacuum in the void between the walls.

According to the Arrhenius greenhouse theory addition of carbon dioxide to the atmosphere will cause CO2 to absorb IR and thereby warm the air.

Both GH gas molecules and molecules in liquid emit and absorb IR, but an excited molecule in free space may live rather long before it emits radiation.

Here N2 and O2 absorb IR and UV and this results in super heating as their radiative ability is poor.

CO2 being a linear molecule does not absorb IR except when it is bent or stretched and only at about 7 different wavelengths.

It is not surprising that Earth's atmosphere contains only 60 % of an IR layer since O2 and N2 hardly absorb IR, leaving the task of IR absorption to trace amounts of CO2 and H2O.

So if the oceans cant absorb IR to get their heat and if they cant absorb heat from the air (which is actually a good thing otherwise it would be snowball earth time) then where oh where did all the heat go?

They absorb IR photons so gain an excited state then emit other photons in random directions or discharge thermally by collisions.

Argon gas, used in the same experiment you speak of, proves the teacher is lying, as Argon gas does NOT absorb IR radiation, ergo it can not be warmed by a heat lamp as the teacher in your example seem to be claiming.

These experiments purport to be measuring the ability of CO2 to absorb IR radiation compared to air, yet they are often done in containers that are said to be opaque to IR radiation by advocates of the «greenhouse effect» hypothesis.

It is asserted above that the atmosphere can absorb IR and re-emit it.

The majority (99.9 %) of atmospheric gases nitrogen, oxygen and argon do not absorb IR.

BPL: It is the greenhouse gases that absorb the IR.

Only greenhouse gases like CO2 absorb IR, and they collide with other molecules like oxygen, and so everything heats up.

Heteroatomic molecules like HCl absorb IR.

It is more complicated than that, but since the judge only wants to know why O2 and N2 do not absorb IR radiation I thought what I wrote originally was sufficient.

The point is that although selection rules will determine whether a molecular vibration can absorb IR radiation, and is obviously necessary for a complete discussion of the issue, the issue can be simply addressed by consideration of the frequencies of absorption by the gas and emission by the planet.

All gases are greenhouse; they don't need to be able to absorb IR to heat — conduction & convection work perfectly well.

To repeat what I wrote in # 130, which you appear not to have absorbed: «All gases are greenhouse; they don't need to be able to absorb IR to heat — conduction & convection work perfectly well.»

[1] CO2 absorbs IR, is the main GHG, human emissions are increasing its concentration in the atmosphere, raising temperatures globally; the second GHG, water vapor, exists in equilibrium with water / ice, would precipitate out if not for the CO2, so acts as a feedback; since the oceans cover so much of the planet, water is a large positive feedback; melting snow and ice as the atmosphere warms decreases albedo, another positive feedback, biased toward the poles, which gives larger polar warming than the global average; decreasing the temperature gradient from the equator to the poles is reducing the driving forces for the jetstream; the jetstream's meanders are increasing in amplitude and slowing, just like the lower Missippi River where its driving gradient decreases; the larger slower meanders increase the amplitude and duration of blocking highs, increasing drought and extreme temperatures — and 30,000 + Europeans and 5,000 plus Russians die, and the US corn crop, Russian wheat crop, and Aussie wildland fire protection fails — or extreme rainfall floods the US, France, Pakistan, Thailand (driving up prices for disk drives — hows that for unexpected adverse impacts from AGW?)

We now put an air parcel between the observer and the back wall, a parcel which absorbs IR radiation exiting from the wall to the observer.

How long does a CO2 molecule at 5.5 kms height hold on to that absorbed IR photon before it is released (emitted or transferred though collision to another atmospheric molecule)?

About a century ago, Angstrom called Arrhenius out on his bad first attempt to measure how well CO2 absorbs IR.

This additional water vapor also absorbs IR and this extra warming gets added to the original warming from CO2 alone.

We know CO2 absorbs IR.

Let's say a CO2 molecule in the atmosphere absorbs an IR photon.

Reflection of IR back into the coffee and downward emission of absorbed IR both have the same effect of reducing heat loss.

In the next part of my posts will be my experiment that shows that the GHGE does not exist and another paper that relates back to what I learn from a physics professor when learning quantum physics (55 years ago) and the Bohr model (which has had revisions with time) the basic is that a gas does not «heat» when it absorbs IR, it has an increase of internal energy.

This increases absorbed IR by a factor of 5, offset in the hind0 - casting by exaggerated cloud albedo, hence evaporation and heating rate is artificially increased.

CO2 absorbs IR in bandwidths which most glass transmits well — especially the 2.7 micron band which a lamp emits a considerable amount of.

Greenhouse gases «trap» radiative energy because they absorbed IR radiation from the Earth's surface which then continually «bounces up and down».

CO2 absorbs IR radiation primarily at 12 to 15 microns, inside what is known as the «Water Vapor Window».