Can You Push Things With Light?

In this video I test whether or not you can push things with light! I talk about whether or not light has mass. Instead of tying a fly to a string (previous lassoing a fly video), I make an apparatus in the vacuum chamber that can measure the push of light! And if it doesn't have mass how could it push things, and could you weigh light on a scale?

WARNING:
If you use the information from this video for your own projects then you assume complete responsibility for the results.

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[ProPlayer-wqnu]

You can actually push someone with light! Just point laser in someone eyes and he will move!

[dream.machine]

Your videos are so intelligent! And at the same time very down to earth, reasonable and free. I always look forward to your videos.

[bluestonethend]

3:28 "Its getting lighter actually"
Was that a pun?

[hqcart]

DOES THIS MEAN EARTH IS GETTING PUSHED AWAY FROM SUNLIGHT?

[seanm]

Yeah I think it’s pushing it very *LIGHTLY*. 😂

[ftlPhysicsGuy]

Relativistic mass - ugh... As a physicist, I have to agree with Einstein himself who did not care for the concept of relativistic mass (which depends on the observer) and instead preferred to use the concepts of (rest) mass, (relativistic) momentum, and total energy. Mass is a convenient form of energy, and the amount of energy in an object due to its mass is invariant (it does not depend on the observer). Momentum, involves motion and must dependent on the observer. E^2 = m^2*c^4 + p^2*c^2 (where m is the "rest" mass, p is momentum, E is total energy, and c is the speed of light) is how we relate energy, mass, and momentum; and light (via photons) has momentum and energy related to its frequency (not due to any mass). Man, I feel better after getting that off my chest :)

[RedstoneFederation]

3:30 "it's getting lighter"

[rrsharizam]

I always knew this since I saw Goku pushed Frieza with Kamehameha

[AwakenEmile]

Where were you during my science classes?!

Another great video! 🤙🏾

[journey]

I love how your videos are so high quality, keep up the good work.

[yt]

There are actually "sunsails". Scientists try to use them for traveling in space without fuel, but they're not completely developed yet.

[Tyrranid]

A photon books into a hotel. The bellhop asks him "may i take your luggage" and the photon replies "no i'm traveling light"

[holycow]

Wow, I didn't expect you can actually move an object with light in home lab! If you place the camera at 90 degree from laser beem then the movement could be even more visible! Very well done experiment anyway!

[yellowkiyu]

"My 5000 something laser"





"OUR 5000 something laser"

[carleemalmberg]

Thank you for always teaching me and stimulating my mind! We love you sooo much!!

[nivlek]

Here's an idea. Radiometers that are sold commercially are supposed to move away from the white side due to reflected photons applying twice the momentum of absorbed photons. They actually spin the opposite direction and nobody seems to notice this or question why. I figure that it's because of the incomplete vacuum inside the glass bulb. The minute amount of gas next to the black side of the blade is heated more than the gas on the white side (due to extra heating because black absorbs the energy more than white). This warmer gas is more agitated and thus can push on the blade more than on the other side. We have been hoodwinked by these devices for many years.

[vinodkumar-wmoq]

That's radiation pressure!!!! Cool demonstration with the shiny pendulum. Good job!
Even space crafts have to keep account of the radiation pressure from the sun, otherwise after long periods it can seriously offset their trajectory. Some space probes also use radiation pressure to turn without wasting energy (as a last option, if the 3 gyroscopic wheels inside it which spin to change the orientation of the probe fail).

[DL-kcfc]

The home "vacuum chamber" still contains residual air, meaning that it is not ideal for this light experiment. Air molecules heated by a laser beam strike the leaf and cause it to react reactively. Evaporation of the material from the leaf also contributes to the movement, which also participates in the reactive movement. The principle is the same that happens in the Crookes radiometer. The black color of the blades of the radiometer better ensures the heating of air molecules close to the blades and better evaporation of the black layer, which causes its wild rotation. A home laser can develop a power on a ticket from the momentum of relativistic "heavy" photons in unmeasurable values, ie ... nothing. Therefore, for example, a solar sailboat must have an area of several square kilometers in order to be able to move at all, and it is affected by a whole range of electromagnetic radiation from a rich source such as the Sun.

[amitavmostafa]

Liked before watching cause I know whatever you do is gonna be awesome

[julistanleyA]

I read about this in a book today and though, “oh, this sounds like something Action Lab could do in their vacuum chamber”, and I googled and was not disappointed! Thank you! 😄