photons carry hardly any momentum per unit energy (if it's photons the device would spin the other way round since reflection changes the momentum twice as much as absorption). it's the air molecules' momentum. Black gets heated and the black material's molecules vibrate. When an air molecule hits the black side it recoils more than if it hits the white (cooler) side.
Remember people, on the coming months of September to December, there were 2 volcanoes that would erupt in the US, the name of these volcanoes have something to do with faith. This eruption is a trumpet blast from God. Repent now people! Avoid pornography, smoking, cursing, fornication, adultery, immorality, occultism etc. Be holy; do not turn to church for salvation, turn to Christ
It doesn't spin because the black side heats up faster than the white side. It spins because the photons transfer less momentum to the black side to the white side. The black side absorbs all of the momentum from the photons, whereas the white side reflects the photons and thus receives twice the momentum required to stop the photon.
That sounds like the obvious explanation at first. But if you watch the video you'll see the light mill doesn't turn the direction you would expect if that explanation were correct.
It spins because the black side absorbs the momentum and energy of the photons and the white side absorbs less photons (reflects more photons). that's why it turns in the direction that you see
If it were photons it would spin faster in a vacuum; it doesn't spin at all in a vacuum.
If it were air pressure imbalance on the black side of the vanes alone; it would not reverse rotation when moved to a cold area.
The sphere causes a micro whether system to develop similar to the spinning weather systems we see in earth's atmosphere.
Hope this is helpful.
JosephJonathanGould 1 month ago
Circulating air eddy currents cause the rotation.
1. Air density ratio inside to outside the bulb is critical.
2. Moving the radiometer to a cold dark area causes reverse rotation until vanes reach the same temperature.
3. Air near the black side of vanes is heated/excited more than the air near the silvered side causing a slight pressure embalance.
4. The silvered side of the vanes must be insulated from the black side of the vains so that the two sides do not reach the same temperature.
JosephJonathanGould 1 month ago
photons carry hardly any momentum per unit energy (if it's photons the device would spin the other way round since reflection changes the momentum twice as much as absorption). it's the air molecules' momentum. Black gets heated and the black material's molecules vibrate. When an air molecule hits the black side it recoils more than if it hits the white (cooler) side.
huskykhtam 7 months ago
air in a vaccum?
advthinker 8 months ago
This has been flagged as spam show
.
Remember people, on the coming months of September to December, there were 2 volcanoes that would erupt in the US, the name of these volcanoes have something to do with faith. This eruption is a trumpet blast from God. Repent now people! Avoid pornography, smoking, cursing, fornication, adultery, immorality, occultism etc. Be holy; do not turn to church for salvation, turn to Christ
.
conceil8 2 years ago
It doesn't spin because the black side heats up faster than the white side. It spins because the photons transfer less momentum to the black side to the white side. The black side absorbs all of the momentum from the photons, whereas the white side reflects the photons and thus receives twice the momentum required to stop the photon.
coldplasma 4 years ago
That sounds like the obvious explanation at first. But if you watch the video you'll see the light mill doesn't turn the direction you would expect if that explanation were correct.
NoizHed 3 years ago
It spins because the black side absorbs the momentum and energy of the photons and the white side absorbs less photons (reflects more photons). that's why it turns in the direction that you see
J0Boa 1 year ago
Look which way the mill is turning!
NoizHed 3 years ago
imposibble!!!
dewiltheone1 4 years ago
no way, I used to have one it spins wicked fast in the sun!
coolbluelights 4 years ago
thanks for sharing. Reasonable :)
FiercefulXxX 4 years ago