In a surprising finding, light can make water evaporate without heat
https://www.sciencedaily.com/releases/2023/11/231101180644.htm
Source:
Massachusetts Institute of Technology
Summary:
At the interface of water and air, light can, in certain conditions, bring about evaporation without the need for heat, according to a new study.

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On Thursday, November 2, 2023 at 2:44:03 PM UTC+11, Jan Panteltje wrote:

In a surprising finding, light can make water evaporate without heat https://www.sciencedaily.com/releases/2023/11/231101180644.htm
Source:
Massachusetts Institute of Technology
Summary:
At the interface of water and air, light can, in certain conditions, bring about evaporation without the need for heat, according to a new study.

That's scientifically illiterate. Evaporation always need energy - the discussion is about situations where photons of a specific wavelength can supply that energy directly.

It might be a more efficient mechanism than providing the energy by making the water below the surface warmer, but it still takes energy.

--
Bill Sloman, Sydney

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In message <1618773f-52dd-42fd-a839-f0f637cc70bbn@googlegroups.com>,
Anthony William Sloman <bill.sloman@ieee.org> writes

On Thursday, November 2, 2023 at 2:44:030 >> In a surprising finding, light can make water evaporate without heat

https://www.sciencedaily.com/releases/2023/11/231101180644.htm
Source:
Massachusetts Institute of Technology
Summary:
At the interface of water and air, light can, in certain conditions,
bring about evaporation without the need for heat, according to a new >>study.

That's scientifically illiterate. Evaporation always need energy - the >discussion is about situations where photons of a specific wavelength
can supply that energy directly.

It might be a more efficient mechanism than providing the energy by
making the water below the surface warmer, but it still takes energy.

Ah free energy , which you get when it condenses back.

Brian
--
Brian Howie

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On Thursday, November 2, 2023 at 12:32:14 AM UTC-4, Anthony William Sloman wrote:

On Thursday, November 2, 2023 at 2:44:03 PM UTC+11, Jan Panteltje wrote:

In a surprising finding, light can make water evaporate without heat https://www.sciencedaily.com/releases/2023/11/231101180644.htm
Source:
Massachusetts Institute of Technology
Summary:
At the interface of water and air, light can, in certain conditions, bring about evaporation without the need for heat, according to a new study.

That's scientifically illiterate. Evaporation always need energy - the discussion is about situations where photons of a specific wavelength can supply that energy directly.

It might be a more efficient mechanism than providing the energy by making the water below the surface warmer, but it still takes energy.

It's a collision phenomenon, which is a different form of energy input, not heat:

'They began to suspect that the excess evaporation was being caused by the light itself -- that photons of light were actually knocking bundles of water molecules loose from the water's surface. This effect would only take place right at the boundary
layer between water and air, at the surface of the hydrogel material -- and perhaps also on the sea surface or the surfaces of droplets in clouds or fog.'

'The researchers found that the effect varied with color and peaked at a particular wavelength of green light. Such a color dependence [*]has no relation to heat[*], and so supports the idea that it is the light itself that is causing at least some of
the evaporation.'

--
Bill Sloman, Sydney

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On Wednesday, November 1, 2023 at 11:44:03 PM UTC-4, Jan Panteltje wrote:

In a surprising finding, light can make water evaporate without heat https://www.sciencedaily.com/releases/2023/11/231101180644.htm
Source:
Massachusetts Institute of Technology
Summary:
At the interface of water and air, light can, in certain conditions, bring about evaporation without the need for heat, according to a new study.

BS can't pickup anything that doesn't have a flashing neon sign on it. I take the story to mean now we know why plants are green, which is to optimize local humidity near the plant and thus reduce transpiration stress.

'As the relative humidity of the air surrounding the plant increases, the transpiration rate decreases. It is easier for water to evaporate into dryer air than into more saturated air.'

'During a growing season, a leaf will transpire many times more water than its own weight. An acre of corn gives off about 3,000-4,000 gallons (11,400-15,100 liters) of water each day, and a large oak tree can transpire 40,000 gallons (151,000 liters)
per year.'

https://www.noaa.gov/jetstream/ll-leaf

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On Friday, November 3, 2023 at 3:05:08 AM UTC+11, Fred Bloggs wrote:

On Thursday, November 2, 2023 at 12:32:14 AM UTC-4, Anthony William Sloman wrote:

On Thursday, November 2, 2023 at 2:44:03 PM UTC+11, Jan Panteltje wrote:

In a surprising finding, light can make water evaporate without heat https://www.sciencedaily.com/releases/2023/11/231101180644.htm
Source:
Massachusetts Institute of Technology
Summary:
At the interface of water and air, light can, in certain conditions, bring about evaporation without the need for heat, according to a new study.

That's scientifically illiterate. Evaporation always need energy - the discussion is about situations where photons of a specific wavelength can supply that energy directly.

It might be a more efficient mechanism than providing the energy by making the water below the surface warmer, but it still takes energy.

It's a collision phenomenon, which is a different form of energy input, not heat:

'They began to suspect that the excess evaporation was being caused by the light itself -- that photons of light were actually knocking bundles of water molecules loose from the water's surface. This effect would only take place right at the boundary

layer between water and air, at the surface of the hydrogel material -- and perhaps also on the sea surface or the surfaces of droplets in clouds or fog.'

'The researchers found that the effect varied with color and peaked at a particular wavelength of green light.Such a color dependence [*]has no relation to heat[*], and so supports the idea that it is the light itself that is causing at least some of

the evaporation.'

It's still scientifically illiterate. "Heat" is usually taken to "mean heat energy". If they'd wanted to use it to mean "temperature" they should have said so.

"Such a color dependence [*]has no relation to temperature [*], and so supports the idea that it is the light itself that is causing at least some of the evaporation.' "

would have been a better way of expressing what they wanted to say in a scientific context.

--
Bill Sloman, Sydney

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On Thursday, November 2, 2023 at 5:04:43 AM UTC-7, brian wrote:

In message <1618773f-52dd-42fd...@googlegroups.com>,
Anthony William Sloman <bill....@ieee.org> writes

On Thursday, November 2, 2023 at 2:44:030 >> In a surprising finding, light can make water evaporate without heat

https://www.sciencedaily.com/releases/2023/11/231101180644.htm
Source:
Massachusetts Institute of Technology
Summary:
At the interface of water and air, light can, in certain conditions, >>bring about evaporation without the need for heat, according to a new >>study.

That's scientifically illiterate. Evaporation always need energy - the >discussion is about situations where photons of a specific wavelength
can supply that energy directly.

It might be a more efficient mechanism than providing the energy by
making the water below the surface warmer, but it still takes energy.

Ah free energy , which you get when it condenses back.

Well, not exactly; it's solar energy input, usually, and when condensation occurs,
you can get... snow, rain, hurricanes, maybe not useful energy. That same solar energy would, on hitting
an opaque object, create heat which also promotes evaporation.
The important part of this research, is that the spectrum matters for one
cause of evaporation: that opens a few useful possibilities.

Want a shade for a hot city? Use a laser illuminator on a water feature, and create supersaturated moist air
to become a fog.

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On Friday, November 3, 2023 at 4:08:49 AM UTC+11, Fred Bloggs wrote:

On Wednesday, November 1, 2023 at 11:44:03 PM UTC-4, Jan Panteltje wrote:

In a surprising finding, light can make water evaporate without heat https://www.sciencedaily.com/releases/2023/11/231101180644.htm
Source:
Massachusetts Institute of Technology
Summary:
At the interface of water and air, light can, in certain conditions, bring about evaporation without the need for heat, according to a new study.

BS can't pickup anything that doesn't have a flashing neon sign on it. I take the story to mean now we know why plants are green, which is to optimize local humidity near the plant and thus reduce transpiration stress.

And you'd be wrong. Most plants are green because the second generation of photosynthetic plants exploited a different region of the spectrum to first generation, which have different coloured photosynthetic pigments. They were number two and had to do
better. Evaporation wouldn't have come into it.

<snipped the blindingly obvious>

--
Bill Sloman, Sydney

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The arsehole Fred Bloggs <bloggs.fredbloggs.fred@gmail.com> persisting in being an Off-topic troll...

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