Glass
Vegtable oil
Water
Light's apparent speed is fastest definitely in a vacuum and slower in water or glass. Light in air behaves more like in a vacuum than in water or glass.
The answer to "What is the fastest thing that can travel?" is light. Light can travel faster than any other thing in the universe!
Both light and sound can indeed travel through glass. These are substances in which light and sound often travel through.
Light travels fastest through space which has no air. Space is a vacuum which is the fastest way for light to travel.
The light refracts due to the change in speed. The change in speed occurs because the light is travelling through a denser medium. So it will travel fastest through the air and slowest through the glass
It travels fastest in a vacuum.
Both light and sound travel. Light travels the fastest.
Light travels fastest through vacuum.
It is not. The speed of light in any material is inversely proportional to the refractive index of that material. The refractive index of glass depends on the glass and so the speed of light varies between 156 and 204 million metres per second. By contrast, the speed of light in vacuum is nearly 300 million metres per second.Even in pure water ice, light travels at nearly 229 million metres per second. So there is no evidence whatsoever to support the question's claim of "fastest through glass".
Light can travel through transparent and translucent glass.
Glass
outer space