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Light moves fastest through **empty space**. In a vacuum or empty space, light can travel at its maximum speed, which is approximately 299,792 kilometers per second. This speed is often denoted by the letter "c" in physics equations.
In other materials, such as **ocean water**, **silver metal**, and **stained glass**, the speed of light is slower compared to its speed in a vacuum. The speed of light in different materials can be influenced by the optical properties of the material, such as its density and refractive index.
To summarize:
- Light moves fastest in **empty space** because there are no particles to slow it down.
- In materials like **ocean water**, **silver metal**, and **stained glass**, the speed of light is slower due to interactions with the atoms and molecules in the material.
Understanding how the speed of light varies in different mediums is crucial in various scientific fields, including optics and telecommunications.
