liquid
It travels faster in a liquid than in a gas, but it would travel faster still in a solid.
Light travels much faster than sound, through wood.
Light travels fastest through vacuum.
Air.
it travels faster through air.
Light generally doesn't travel faster through solids than through gases. Sound does, but not light.
It doesn't travel faster through a vacuum. In our Universe there is no such thing as empty space.
Light travels slower through denser media, so it travels faster through water than through a diamond.
Light travels fastest through space which has no air. Space is a vacuum which is the fastest way for light to travel.
yes
No.