No. Usually light travels fastest in a vacuum; slower in other substances.
Light travels at 299792458 meters per second in a vacuum.
Light can travel faster through a vacuum than through air. In a vacuum, light travels at its maximum speed of about 299,792 kilometers per second. This is because there are no particles in a vacuum to slow down the light's speed.
When light travels through anything that is not a vacuum, it will usually slow down.
Light travels at its "maximum velocity" in a vacuum. In any other medium, interference makes it appear to slow down. We're giving Čerenkov radiation the day off here.
Yes, light does slow down when it travels through matter, as it interacts with atoms and molecules in the material. This slowing down of light is responsible for effects like refraction and dispersion.
Light travels fastest in a vacuum because there are no particles to interact with and slow it down. It travels slower in air and even slower in water due to the presence of molecules that can scatter and absorb light, causing it to travel at a reduced speed.
As the medium through which light propagates in space is closes to a vacuum, light propagates very well in space. However, it travels at the same speed as it would on earth, as light travels at 299,792,458m/s in a vacuum, regardless of where that vacuum is located. the light travels in same speed whether it travels in space or earth.
Light travels slowest in a medium with a high refractive index, such as glass or water. This is because light is absorbed and re-emitted by atoms in the medium, causing it to slow down compared to its speed in a vacuum.
Light travels slower in oil than in a vacuum because oil has a higher refractive index than a vacuum, which causes light to slow down as it moves through the medium. The denser the medium, the slower light will travel.
it is 3.5 billion times fast in a milli-second I don't know where this answer came from or what it means BUT - sound travels at roughly 700 mph in air at sea level; - light travels at 186,000 miles per second in a vacuum; - assuming we compare sound in air (as it can't travel in a vacuum) and light in a vacuum (as it can slow through a medium such as air or water), then light travels at 830,000 times the speed of sound.
Light travels fastest in a vacuum because there are no particles to slow it down. It slows down in air, even more in water, and even more in glass due to interactions with particles in those mediums.
Light travels faster (up to the speed of light) in a vacuum, which is empty space. Light travels slower through a medium (matter).