Water-clear mediums?

[Anonymous No.1244766]

I want to suspend an object (specifically a rock) in a jar and give it the appearance of floating. How can I do this?

I've been looking at acrylic resin, but I've never poured resin and I'm nervous about getting bubbles. I don't have a pressure chamber.

I've also heard that clear marbles disappear in water. anyone know if that's true? Maybe I could incorporate that somehow.

[Anonymous No.1244775]

>>1244766
>disappear in water
use a solid with the same index of refraction as your liquid

[Anonymous No.1244776]

>>1244775
any suggestions on that?

I fear that I'll have a hard time finding index refraction information on some objects

[Anonymous No.1244778]

>>1244766
Orbeeze mate. And water.

[Anonymous No.1244785]

>>1244776
>I fear that I'll have a hard time finding index refraction information on some objects

Our physics instructor said that by regulation glass objects cannot have the same refraction index as water, because you could be washing them in the sink and break one and not be able to see the pieces.

[Anonymous No.1244859]

>>1244785
>by regulation

I want to be the Index of Refraction cop.

[Anonymous No.1244865]

>>1244776
Borosilicate glass and glycerin. Get some lab tubes and fuse them into a frame to support the rock.

[Anonymous No.1244867]

>>1244776
Have a glass blower create you a jar that is completely full of glass, the subject will be encased in a cylinder of glass, the outside of which takes on the appearance of a jar.
The illusion will only be ruined by the weight, someone removing the lid or if your want the sample back.
But that's the simplest solution, something that had the same r as glass: More glass.

[Anonymous No.1244921]

>>1244766
A vacuum cleaner, a bigger jar, make a one way valve with a small hole in the lid and a glued strip of inner tube over the hole on the outside ( glued like a bandaid, so air can pass out the sides), that's how you solve bubble issues.

[Anonymous No.1244964]

Super cool the rock and put it over a magnet.

[Anonymous No.1244989]

>>1244921

Vacuum cleaners, even the most powerful ones, do not generate nearly enough of a vacuum to de-gas resins.

[Anonymous No.1244994]

>>1244766
Use a material that has the same index of refraction as the container it is inside.

[Anonymous No.1245000]

>>1244766
crystal epoxi resin. To avoid bubles heat the resin slightly to decrease the viscosity.
Many use a blowtorch to do this.

[Anonymous No.1245003]

>>1244766
These people are making this way too hard. How we do it for physics demos is you go to Michaels or some other arts and crafts place and get some clear water beads. (They swell up in water like solidified balls of gel.) The clear ones are invisible in water. Fill the jar with water. Wait for the beads to swell. Take out enough that the rock will sit at the right level. Drop it in.
Now let's be clear that the rock will look like it's in water, not in air. It's a refractive-index thing. But it will appear to be hovering in the middle.

[Anonymous No.1245121]

>>1244921

>vacuum cleaner
>hi pressure vacuum

[Anonymous No.1245426]

>>1245121
>hi pressure vacuum

Oxymoron.

[Anonymous No.1245433]

>>1244785
your professor is a faggot talking out of their ass, or it was a bad attempt at a cheeky joke.

[Anonymous No.1245449]

>>1245003
Do the beads last indefinitely or will they deteriorate?

[Anonymous No.1245453]

>>1245003
You have not removed the difference in refractive index between the glass and the water. It will look like a rock iv s glad of water, not nothing.

[Anonymous No.1245459]

>>1244766
doesnt glycerin have the same reflection index as glass?

[Anonymous No.1245470]

>>1244766
Just pick a flat like rock and use salt water. It should float.

[Anonymous No.1245747]

>>1244766
Can't you just hang the rock by a thread tied to the cap? Also why don't you try gelatin at fiest, to see how your rock reacts and master your pouring skills

[Anonymous No.1246446]

>>1244859
More like factory auditor. Have fun with your mountains of paperwork

[Anonymous No.1246448]

>>1245453

>>1245003
>Now let's be clear that the rock will look like it's in water, not in air

Reading is hard

[Anonymous No.1246857]

>>1244785
Just drain the sink, fucko. This is why we can't have levitating things.

[Anonymous No.1248239]

>>1244785
> by regualtion

And by basic physics. What mainly determines the refractive index is specific gravity. Glass has a SG of right around 2.65, while water has a SG of 1. The denser the substance, usually the higher the refractive index.

[Anonymous No.1248275]

>>1245003
Oh dang I remember seeing an infographic about this on /toy/. Something about using pellets used for hydrating plants.

[Anonymous No.1248279]

>>1248239
So basically OP needs a heavier transparent liquid like glycerine or glycol to match the RI of glass, or a plastic with a similar RI to water.

[Anonymous No.1248299]

>>1245459
Its index of refraction is nearly identical to borosilicate glass, hence >>1244865. Soda-lime glass is close enough to disappear if you don't look too closely, but movement or close examination can reveal faint ghosting, especially if the glass isn't colorless.

>>1248239
>What mainly determines the refractive index is specific gravity.
What mainly determines the refractive index is the electron density. Diamond, for example, has a higher refractive index than the much denser cubic zirconia due to its exceptionally dense electrons (which also contribute to its extreme hardness and incompressability). Refractive index also varies by frequency.

[Anonymous No.1250384]

>>1248299
Never knew that about electron density, now it makes so much sense why there's a direct relationship between refractive index and dielectric constant of a given material.

Refractive index also determines the change in polarization upon reflection, which is dependent not just on frequency but also on the angle and plane of incidence of the light. But that shouldn't matter for OP.