Hello!
So, Mr Lim showed us that experiment and here am I, explaining why it happens and hoping that it is correct.
I guess I don't need to explain the experiment, so people, base it on your memory!
Haha.
Anyway, firstly, before we proceed, this is what glycerin is.
Glycerin:
- Attracts moisture to your skin.
- It is a natural by-product of the soapmaking process and while commercial manufacturers remove the glycerin for use in their more profitable lotions and creams, handcrafted soap retains glycerin in each and every bar.
- Glycerin is a neutral, sweet-tasting, colorless, thick liquid which freezes to a gummy paste and which has a high boiling point.
- Glycerin can be dissolved into water or alcohol, but not oils.
- Many things will dissolve into glycerin easier than they do into water or alcohol. So it is a good solvent.
- It is also highly "hygroscopic" which means that it absorbs water from the air.
- It softens the skin
Oh, and I found a video of the experiment, hope you enjoy it!
Explanation:
What happens is that the glycerin and the bottles have the same refraction index/optical density. Because the light that is going through the glycerin and the bottles is just as easy in both, your eye can't see any different between them. Normally you would see the bottle by the shape in water. But you can't here, that's why it looks like it disappear! Still you can see the glass bottle in the drinking glass. There is a narrow gap between the tow, clearly visible. If it was water, the gap would be much wider and the bottle easier to spot.
OR
Light breaks through glass at the same angle as it does in glycerin.
